Entity Central Index Key The operating profitability of each segment, reflecting adjusted earnings before interest, taxes, depreciation and amortization. Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable (net of allowances of $1,861 and $1,700 at March 31, 2018 and December 31, 2017, respectively) Accounts Receivable Net Current Prepaid income taxes Prepaid Taxes Prepaid and other assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property, equipment and leasehold improvements (net of accumulated depreciation and amortization of $177,562 and $171,280 at March 31, 2018 and December 31, 2017, respectively) Property Plant And Equipment Net Goodwill Goodwill Intangible assets (net of accumulated amortization of $519,640 and $507,612 at March 31, 2018 and December 31, 2017, respectively) Finite Lived Intangible Assets Net Deferred tax assets Deferred Tax Assets Net Noncurrent Other non-current assets Other Assets Noncurrent Total assets Assets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Income taxes payable Accrued Income Taxes Current Accrued compensation and related benefits Employee Related Liabilities Current Other accrued liabilities Other Accrued Liabilities Current Deferred revenue Deferred Revenue Current Total current liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Deferred taxes Deferred Tax Liabilities Noncurrent Other non-current liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and Contingencies (see Note 7 and Note 8) Commitments And Contingencies Shareholders' equity: Stockholders Equity [Abstract] Preferred stock (par value $0.01, 100,000,000 share authorized; no shares issued) Preferred Stock Value Common stock (par value $0.01; 750,000,000 common shares authorized; 129,953,761 and 129,543,856 common shares issued and 89,859,658 and 90,104,885 common shares outstanding at March 31, 2018 and December 31, 2017, respectively) Common Stock Value Treasury shares, at cost (40,094,103 and 39,438,971 common shares held at March 31, 2018 and December 31, 2017, respectively) Treasury Stock Value Additional paid in capital Additional Paid In Capital Common Stock Retained earnings Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total shareholders' equity Stockholders Equity Total liabilities and shareholders' equity Liabilities And Stockholders Equity Accounts receivable, allowances Allowance For Doubtful Accounts Receivable Current Property, equipment and leasehold improvements, accumulated depreciation and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Intangible assets, accumulated amortization Finite Lived Intangible Assets Accumulated Amortization Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Treasury shares Treasury Stock Shares Income Statement [Abstract] Operating revenues Revenues Operating expenses: Costs And Expenses [Abstract] Cost of revenues Cost Of Revenue Selling and marketing Selling And Marketing Expense Research and development Research And Development Expense General and administrative General And Administrative Expense Amortization of intangible assets Amortization Of Intangible Assets Depreciation and amortization of property, equipment and leasehold improvements Depreciation Total operating expenses Costs And Expenses Operating income Operating Income Loss Interest income Investment Income Interest Interest expense Interest Expense Other expense (income) Other Nonoperating Income Expense Other expense (income), net Nonoperating Income Expense Income before provision for income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Earnings per basic common share Earnings Per Share Basic Earnings per diluted common share Earnings Per Share Diluted Weighted average shares outstanding used in computing earnings per share Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Dividend declared per common share Common Stock Dividends Per Share Declared Statement Of Income And Comprehensive Income [Abstract] Net income Other comprehensive income (loss): Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax Income tax effect Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax Foreign currency translation adjustments, net Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Pension and other post-retirement adjustments Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax Income tax effect Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Pension and other post-retirement adjustments, net Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax Net investment hedge adjustments Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax Income tax effect Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax Net investment hedge adjustments, net Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax Other comprehensive income (loss), net of tax Other Comprehensive Income Loss Net Of Tax Comprehensive income Comprehensive Income Net Of Tax Supplemental disclosures of non cash investing activities. Supplemental disclosures of non cash financing activities. Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Amortization of intangible assets Adjustment For Amortization Stock-based compensation expense Share Based Compensation Depreciation and amortization of property, equipment and leasehold improvements Depreciation Depletion And Amortization Amortization of debt origination fees Amortization Of Financing Costs Deferred taxes Deferred Income Tax Expense Benefit Other non-cash adjustments Other Noncash Income Expense Changes in assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Prepaid income taxes Increase Decrease In Prepaid Taxes Prepaid and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued compensation and related benefits Increase Decrease In Employee Related Liabilities Income taxes payable Increase Decrease In Accrued Income Taxes Payable Other accrued liabilities Increase Decrease In Other Accrued Liabilities Deferred revenue Increase Decrease In Deferred Revenue Other Increase Decrease In Other Operating Capital Net Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures Payments To Acquire Property Plant And Equipment Capitalized software development costs Payments For Software Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from exercise of stock options Proceeds From Stock Options Exercised Repurchase of treasury shares Payments For Repurchase Of Common Stock Payment of dividends Payments Of Dividends Common Stock Net cash used in financing activities Net Cash Provided By Used In Financing Activities Effect of exchange rate changes Effect Of Exchange Rate On Cash And Cash Equivalents Net decrease in cash Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalent, beginning of period Cash and cash equivalent, end of period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Net Cash paid for income taxes Income Taxes Paid Net Supplemental disclosure of non-cash investing activities Supplemental Disclosures Of Non Cash Investing Activities [Abstract] Property, equipment and leasehold improvements accrued, but not yet paid Capital Expenditures Incurred But Not Yet Paid Supplemental disclosure of non-cash financing activities Supplemental Disclosures Of Non Cash Financing Activities [Abstract] Cash dividends declared, but not yet paid Dividends Payable Current And Noncurrent Organization Consolidation And Presentation Of Financial Statements [Abstract] Introduction and Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Changes And Error Corrections [Abstract] Recent Accounting Standards Updates New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Revenue From Contract With Customer [Abstract] Revenue Recognition Revenue From Contract With Customer [Text Block] Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Property Plant And Equipment [Abstract] Property, Equipment and Leasehold Improvements Property Plant And Equipment Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill And Intangible Assets Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Equity [Abstract] Shareholders' Equity Stockholders Equity Note Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of financial statements and use of estimates. Basis of Presentation and Use of Estimates Basis Of Financial Statements And Use Of Estimates Policy [Text Block] Concentrations Concentration Risk Credit Risk Recent Accounting Standards Updates New Accounting Pronouncements Policy Policy [Text Block] Statement [Table] Statement [Table] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] Accounting Standards Update 2014-09 [Member] Accounting Standards Update201409 [Member] Statement [Line Items] Statement [Line Items] Cumulative Impact of Adoption on Company’s Unaudited Condensed Consolidated Statement of Financial Condition Schedule Of Prospective Adoption Of New Accounting Pronouncements Table [Text Block] Schedule of Impact of Adopting New Standard on Company's Unaudited Condensed Consolidated Statement of Income and Statement of Financial Condition Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Disaggregation of Revenue Disaggregation Of Revenue Table [Text Block] Schedule of Accounts Receivable and Deferred Revenue Contract With Customer Asset And Liability Table [Text Block] Computation of Basic and Diluted EPS Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Property, Equipment and Leasehold Improvements Property Plant And Equipment [Text Block] Schedule of Goodwill by Reportable Segment Schedule Of Goodwill [Text Block] Schedule of Gross Carrying and Accumulated Amortization Amounts Related to Company's Identifiable Intangible Assets Schedule Of Finite Lived Intangible Assets Table [Text Block] Estimated Amortization Expense for Remainder of 2018 and Succeeding Years Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Schedule of Company's Common Stock Repurchases Made on Open Market Schedule Of Treasury Stock By Class [Text Block] Schedule of Dividends Declared Per Common Share and Total Amounts Declared, Distributed and Deferred Dividends Declared Table [Text Block] Summary of Activity Related to Shares of Common Stock Issued and Repurchased Schedule Of Common Stock Outstanding Roll Forward Table [Text Block] Operating Revenue by Reportable Segment Reconciliation Of Revenue From Segments To Consolidated [Text Block] Segment Profitability and Reconciliation to Net Income Schedule Of Segment Reporting Information By Segment [Text Block] Revenue by Geographic Area Schedule Of Revenue From External Customers Attributed To Foreign Countries By Geographic Area [Text Block] Long-Lived Assets by Geographic Area Schedule Of Entity Wide Disclosure On Geographic Areas Long Lived Assets In Individual Foreign Countries By Country [Text Block] Number of major customers. Introduction and basis of presentation. Schedule Of Introduction And Basis Of Presentation [Table] Schedule Of Introduction And Basis Of Presentation [Table] Schedule Of Introduction And Basis Of Presentation [Table] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Operating Revenues [Member] Sales Revenue Services Net [Member] Segments Statement Business Segments [Axis] Segments Segment [Domain] Index. Index [Member] Index [Member] Analytics. Analytics [Member] Analytics [Member] All Other [Member] All Other Segments [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer Major Customers [Axis] Customer Name Of Major Customer [Domain] BlackRock Inc. BlackRock Inc [Member] Blackrock Inc [Member] Introduction And Basis Of Presentation [Line Items] Introduction And Basis Of Presentation [Line Items] Percentage of operating revenues accounted for by major customer Concentration Risk Percentage1 Number of major customers represented 10.0% or more of revenues Number Of Major Customers Non service pension costs. New Accounting Pronouncements And Changes In Accounting Principles [Abstract] Non-service related pension costs Non Service Pension Costs The percentage of value of the total cost of the software recognized as revenue upon the transfer of the software code key to the customer. Revenue recognition. Schedule of revenue recognition. Schedule Of Revenue Recognition [Table] Schedule Of Revenue Recognition [Table] Initial Application Period Cumulative Effect Transition Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition Initial Application Period Cumulative Effect Transition [Domain] Adjustments due to Adoption of ASC 606 [Member] Difference Between Revenue Guidance In Effect Before And After Topic606 [Member] Revenue Recognition [Line Items] Revenue Recognition [Line Items] Revenue, performance obligation satisfied at point in time, transfer of control, description Revenue Performance Obligation Satisfied At Point In Time Transfer Of Control Percentage of value of software and remaining performance obligation Revenue Percentage Of Performance Obligation Software Code Key Transferred To Customer Represents Revenue, performance obligations and revenue recognition, description Revenue Performance Obligation Description Of Timing Revenue Initial Application Period Cumulative Effect Transition [Table] Revenue Initial Application Period Cumulative Effect Transition [Table] Revenue Initial Application Period Cumulative Effect Transition [Line Items] Revenue Initial Application Period Cumulative Effect Transition [Line Items] Accounts receivable Accounts Receivable Net Income taxes payable Accrued Income Taxes Deferred revenue Deferred Revenue Increase (decrease) in accounts receivable and deferred revenue net. Increase to accounts receivable and deferred revenue Increase Decrease In Accounts Receivable And Deferred Revenue Net Impact of Change [Member] Without Adoption of ASC 606 [Member] Calculated Under Revenue Guidance In Effect Before Topic606 [Member] Statement of Income Operating income Income before provision for income taxes Statement of Financial Condition Accounts receivable Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Products and Services Product Or Service [Axis] Products and Services Products And Services [Domain] Recurring subscriptions. Recurring Subscriptions [Member] Recurring Subscriptions [Member] Asset-based fees. Asset-based Fees [Member] Asset Based Fees [Member] Non-recurring. Non-recurring [Member] Non Recurring [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Operating revenues Revenue From Contract With Customer Excluding Assessed Tax Accounts receivable, Increase/(decrease) Revenue recognized during period included in deferred revenue Deferred Revenue Revenue Recognized1 Contract with Customer, Duration Contract With Customer Duration [Axis] Contract with Customer, Duration Contract With Customer Duration [Domain] Contract with One Year or More [Member] Long Term Contract With Customer [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date [Axis] Remaining performance obligations Revenue Remaining Performance Obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period Basic weighted average common shares outstanding Effect of dilutive securities: Dilutive Securities [Abstract] Stock options and restricted stock units Incremental Common Shares Attributable To Share Based Payment Arrangements Diluted weighted average common shares outstanding Long lived, depreciable assets that are used in the creation, maintenance and utilization of information systems. Computer & related equipment Computer And Related Equipment Gross Furniture & fixtures Furniture And Fixtures Gross Leasehold improvements Leasehold Improvements Gross Work-in-process Construction In Progress Gross Subtotal Property Plant And Equipment Gross Accumulated depreciation and amortization Property, equipment and leasehold improvements, net Schedule Of Goodwill [Table] Schedule Of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill, Beginning balance Foreign exchange translation adjustment Goodwill Foreign Currency Translation Gain Loss Goodwill, Ending balance Subsegments Subsegments [Axis] Subsegments Subsegments [Domain] ESG segment. ESG [Member] E S G Segment [Member] Real estate segment. Real Estate [Member] Real Estate Segment [Member] Goodwill Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Acquired intangible assets. Acquired Intangible Assets [Member] Acquired Intangible Assets [Member] Capitalized Software [Member] Software Development [Member] Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table] Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table] Customer Relationships [Member] Customer Relationships [Member] Trademarks/Trade Names [Member] Trademarks And Trade Names [Member] Technology or software. Technology/Software [Member] Technology Or Software [Member] Proprietary databases and systems. Proprietary Data [Member] Proprietary Databases And Systems [Member] Finite lived intangible asset. Subtotal [Member] Finite Lived Intangible Asset [Member] Foreign currency translation adjustment. Foreign Exchange Translation Adjustment [Member] Foreign Currency Translation Adjustment [Member] Acquired Finite Lived Intangible Assets [Line Items] Acquired Finite Lived Intangible Assets [Line Items] Gross carrying value Finite Lived Intangible Assets Gross Accumulated amortization Net carrying value Remainder 2018 Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year 2019 Finite Lived Intangible Assets Amortization Expense Year Two 2020 Finite Lived Intangible Assets Amortization Expense Year Three 2021 Finite Lived Intangible Assets Amortization Expense Year Four 2022 Finite Lived Intangible Assets Amortization Expense Year Five Thereafter Finite Lived Intangible Assets Amortization Expense After Year Five Schedule of commitments and contingencies. Schedule of commitments and contingencies. Schedule Of Commitments And Contingencies [Table] Schedule Of Commitments And Contingencies [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Five point two five percent senior unsecured notes due two thousand twenty four. 5.250% Senior Unsecured Notes Due 2024 [Member] Five Point Two Five Percent Senior Unsecured Notes Due Two Thousand Twenty Four [Member] Term loan A. Term Loan [Member] Term Loan [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Senior Notes [Member] Senior Notes [Member] Five point seven five percent senior unsecured notes due two thousand twenty five. 5.75% Senior Unsecured Notes Due 2025 [Member] Five Point Seven Five Percent Senior Unsecured Notes Due Two Thousand Twenty Five [Member] Four point seven five percent senior unsecured notes due two thousand twenty six. 4.75% Senior Unsecured Notes Due 2026 [Member] Four Point Seven Five Percent Senior Unsecured Notes Due Two Thousand Twenty Six [Member] Five point seven five percent senior notes due in two thousand twenty five. 5.75% Senior Notes Due In 2025 [Member] Five Point Seven Five Percent Senior Notes Due In Two Thousand Twenty Five [Member] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Two thousand fourteen revolving credit agreement. 2014 Revolving Credit Agreement [Member] Two Thousand Fourteen Revolving Credit Agreement [Member] Revolving credit agreement. Revolving Credit Agreement [Member] Revolving Credit Agreement [Member] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Prepaid and Other Assets [Member] Prepaid Expenses And Other Current Assets [Member] Other Non-Current Assets [Member] Other Noncurrent Assets [Member] Long term debts. Long-term Debt [Member] Long Term Debts [Member] Senior notes and revolving credit facility. Senior Notes and Revolving Credit Facility [Member] Senior Notes And Revolving Credit Facility [Member] Schedule Of Commitments And Contingencies [Line Items] Schedule Of Commitments And Contingencies [Line Items] Annual rent expense Operating Leases Rent Expense Net Debt instrument principal amount Debt Instrument Face Amount Debt instrument interest rate Debt Instrument Interest Rate Stated Percentage Outstanding indebtedness, amount Longterm Debt Percentage Bearing Variable Interest Amount Net proceeds from borrowing Proceeds From Debt Net Of Issuance Costs Maturity date Debt Instrument Maturity Date Redemption description Debt Instrument Redemption Description Percentage of aggregate principal amount redeemed Debt Instrument Redemption Price Percentage Of Principal Amount Redeemed Redemption price Debt Instrument Redemption Price Percentage Period extended on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Revolving credit facility, maximum borrowing Line Of Credit Facility Maximum Borrowing Capacity Revolving credit agreement, term Line Of Credit Facility Expiration Period Revolving credit agreement, conditional description Line Of Credit Facility Description Revolving credit agreement, extended term Line Of Credit Facility Expiration Period Extended Deferred financing fees Deferred Finance Costs Net Fair market value of debt obligations Debt Instrument Fair Value Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Class Of Treasury Stock [Table] Class Of Treasury Stock [Table] Share Repurchase Program Share Repurchase Program [Axis] Share Repurchase Program Share Repurchase Program [Domain] Two thousand fifteen repurchase program. 2015 Repurchase Program [Member] Two Thousand Fifteen Repurchase Program [Member] Two thousand sixteen repurchase program. 2016 Repurchase Program [Member] Two Thousand Sixteen Repurchase Program [Member] Equity, Class of Treasury Stock [Line Items] Equity Class Of Treasury Stock [Line Items] Repurchase program authorizing the purchase of shares Stock Repurchase Program Authorized Amount1 Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program Remaining Authorized Repurchase Amount1 Open market purchases of common stock. Open Market Purchases of Common Stock [Member] Open Market Purchases Of Common Stock [Member] Average Price Paid Per Share Treasury Stock Acquired Average Cost Per Share Total Number of Shares Repurchased Treasury Stock Shares Acquired Dollar Value of Shares Repurchased Treasury Stock Value Acquired Cost Method Increase decrease in deferred dividends. Statement Of Stockholders Equity [Abstract] Cash dividends declared, Amount Dividends Cash dividends distributed, Amount Payments Of Dividends Cash dividends deferred, Amount Increase Decrease In Deferred Dividends Stock issued during period shares stock new issues and options exercised. Stock issued during period shares new issues to directors. Common stock outstanding. Common Stock Outstanding [Table] Common Stock Outstanding [Table] Common Stock Outstanding [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common stock issued. Common Stock Issued [Member] Common Stock Issued [Member] Treasury Stock [Member] Treasury Stock [Member] Common Stock Outstanding [Line Items] Common Stock Outstanding [Line Items] Beginning balance Dividend payable/paid Common Stock Dividends Shares Common stock issued and exercise of stock options Stock Issued During Period Shares Stock New Issues And Options Exercised Shares withheld for tax withholding and exercises Shares Paid For Tax Withholding For Share Based Compensation Shares repurchased under stock repurchase programs Shares issued to directors Stock Issued During Period Shares New Issues To Directors Ending balance Income Tax Examination [Table] Income Tax Examination [Table] Accounting Standards Update 2016-09 [Member] Accounting Standards Update201609 [Member] New Accounting Pronouncement, Early Adoption New Accounting Pronouncement Early Adoption [Axis] New Accounting Principles, Early Adoption New Accounting Principles Early Adoption [Member] New Accounting Pronouncement, Early Adoption, Effect [Member] New Accounting Pronouncement Early Adoption Effect [Member] Income Tax Authority Income Tax Authority [Axis] Income Tax Authority Income Tax Authority [Domain] State and Local Jurisdiction [Member] State And Local Jurisdiction [Member] Domestic Tax Authority [Member] Domestic Country [Member] Income Tax Authority, Name Income Tax Authority Name [Axis] Income Tax Authority, Name Income Tax Authority Name [Domain] New York State Division of Taxation and Finance [Member] New York State Division Of Taxation And Finance [Member] Internal Revenue Service (IRS) [Member] Internal Revenue Service I R S [Member] Range Range [Axis] Range Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Morgan Stanley. Morgan Stanley [Member] Morgan Stanley [Member] Income Tax Examination [Line Items] Income Tax Examination [Line Items] Effective tax rate Effective Income Tax Rate Continuing Operations Tax benefits recognized during the current year that were unrelated to current year earnings. Tax cuts and jobs act of 2017 change in tax rate income tax expense benefit. Tax cuts and jobs act of 2017 change in tax rate, cumulative impact of tax reform, including charge for current year. Amounts effect on effective tax rate Tax Benefits Recognized During The Current Year And Unrelated To Current Year Earnings Amount of excess tax benefits recognition Excess Tax Benefit From Share Based Compensation Operating Activities Decrease in effective tax rate Effective Income Tax Rate Reconciliation Other Adjustments Net adjustment benefit Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit Cumulative accrual of tax reform, including charge recognized Tax Cuts And Jobs Act Of2017 Change In Tax Rate Cumulative Impact Of Tax Reform Including Charge For Current Year Tax years under examination Income Tax Examination Year Under Examination Significant change in unrecognized tax benefits, reasonably possible Significant Change In Unrecognized Tax Benefits Nature Of Event Significant change in unrecognized tax benefits, not possible Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Estimated Range Not Possible Number of operating segments Number Of Operating Segments Reconciliation Of Revenue From Segments To Consolidated [Table] Reconciliation Of Revenue From Segments To Consolidated [Table] Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting Revenue Reconciling Item [Line Items] Operating revenues Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adjusted EBITDA Operating Segment Profitability Other expense (income), net Schedule Of Revenues From External Customers And Long Lived Assets [Table] Schedule Of Revenues From External Customers And Long Lived Assets [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] United States [Member] UNITED STATES Other America Countries. Other [Member] Other America Countries [Member] Total Americas [Member] Americas [Member] United Kingdom [Member] UNITED KINGDOM Other Europe, Middle East and Africa Countries. Other [Member] Other Europe Middle East And Africa Countries [Member] Europe, the Middle East and Africa ("EMEA") [Member] E M E A [Member] Japan [Member] JAPAN Other Asia and Australia Countries. Other [Member] Other Asia And Australia Countries [Member] Asia and Australia. Total Asia & Australia [Member] Asia And Australia [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues From External Customers And Long Lived Assets [Line Items] Total EMEA [Member] Long-lived assets Noncurrent Assets Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Events [Member] Subsequent Event [Member] Two thousand eighteen repurchase program. 2018 Repurchase Program [Member] Two Thousand Eighteen Repurchase Program [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Value of shares repurchased Repurchase program authorizing the purchase of shares Stock repurchase program, remaining authorized repurchase amount Quarterly dividend declared Quarterly dividend declared date Dividends Payable Date Declared Day Month And Year Quarterly dividend payable date Dividend Payable Date To Be Paid Day Month And Year Quarterly dividend record date Dividends Payable Date Of Record Day Month And Year