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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended | 48 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2010 | Dec. 31, 2017
Tax Act, provisional income tax expense | $ 106.3 | $ 0.0 | $ 0.0 |  |
Tax Act, provisional income tax benefit, remeasurement of deferred tax assets and liabilities | 173.3 |  |  |  |
Tax Act, provisional income tax expense, transition tax on accumulated foreign earnings | 192.1 |  |  |  |
Tax Act, net cash liability, transition tax on accumulated foreign earnings | 102.9 |  |  |  | $ 102.9
Income tax expense, dividends withholding tax on repatriation of foreign earnings | 87.5 |  |  |  |
Income Before Income Taxes [Abstract] |  |  |  |  |
Income before income taxes, Domestic | 832.4 | 805.2 | 803.3 |  |
Income before income taxes, International | 1,052.5 | 1,036.6 | 975.3 |  |
Income Before Income Taxes and Income From Equity Method Investments | 1,884.9 | 1,841.8 | 1,778.6 |  |
Income Tax Expense [Abstract] |  |  |  |  |
Income tax expense, current, Federal | 458.8 | 381.8 | 342.3 |  |
Income tax expense, current, State and local | 36.5 | 12.6 | 29.9 |  |
Income tax expense, current, International | 280.2 | 332.1 | 324.5 |  |
Income tax expense, current | 775.5 | 726.5 | 696.7 |  |
Income tax expense, deferred, Federal | (205.5) | (88.2) | (86.7) |  |
Income tax expense, deferred, State and local | 11.1 | 12.0 | 12.1 |  |
Income tax expense, deferred, International | 115.1 | (49.8) | (38.5) |  |
Income tax expense, deferred | (79.3) | (126.0) | (113.1) |  |
Income tax expense | $ 696.2 | $ 600.5 | $ 583.6 |  |
Reconciliation from the Statutory U.S. Federal Income Tax Rate to Effective Tax Rate [Abstract] |  |  |  |  |
Statutory U.S. federal income tax rate | 35.00% | 35.00% | 35.00% |  |
State and local income taxes, net of federal income tax benefit | 1.30% | 0.90% | 1.50% |  |
Effect of Tax Act | 5.60% | 0.00% | 0.00% |  |
International tax rate differentials | (3.80%) | (4.00%) | (3.70%) |  |
Other | (1.20%) | 0.70% | 0.00% |  |
Effective tax rate | 36.90% | 32.60% | 32.80% |  |
Unrecognized Tax Benefits, Penalties and Interest [Abstract] |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 2.5 | $ 2.3 | $ 1.1 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 16.1 | 11.9 |  |  | 16.1
Deferred tax assets: |  |  |  |  |
Compensation | 173.7 | 307.5 |  |  | 173.7
Tax loss and credit carryforwards | 40.3 | 88.5 |  |  | 40.3
Basis differences from acquisitions | 18.0 | 24.3 |  |  | 18.0
Basis differences from short-term assets and liabilities | 39.5 | 36.2 |  |  | 39.5
Other | 17.8 | 18.7 |  |  | 17.8
Deferred tax assets | 289.3 | 475.2 |  |  | 289.3
Valuation allowance | (3.3) | (3.0) |  |  | (3.3)
Net deferred tax assets | 286.0 | 472.2 |  |  | 286.0
Deferred tax liabilities: |  |  |  |  |
Goodwill and intangible assets | 562.2 | 802.7 |  |  | 562.2
Unremitted foreign earnings | 94.9 | 15.9 |  |  | 94.9
Financial instruments | 41.4 | 132.3 |  |  | 41.4
Basis differences from investments | 9.8 | 1.8 |  |  | 9.8
Deferred tax liabilities | 708.3 | 952.7 |  |  | 708.3
Long-term deferred tax assets | 61.3 | 0.0 |  |  | 61.3
Long-term deferred tax liabilities | 483.6 | 480.5 |  |  | 483.6
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |  |  |
January 1 | 116.9 | 113.0 |  |  |
Current year tax positions | 67.1 | 20.0 |  |  |
Prior year tax positions | 5.5 | 6.5 |  |  |
Reduction of prior year tax positions | (16.5) | (21.9) |  |  |
Settlements | 0.0 | (0.7) |  |  |
Foreign currency translation | 0.7 | 0.0 |  |  |
December 31 | 173.7 | 116.9 | $ 113.0 |  | 173.7
Unrecognized tax benefits that would impact effective tax rate | $ 142.8 | $ 71.0 |  |  | 142.8
Convertible Debt [Member] |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |
Financial instruments |  |  |  | $ 329.0 |
Convertible debt, repayments of convertible debt |  |  |  | $ 1,400.0 |
Taxes paid, cancellation of indebtedness income for debt reacquired |  |  |  |  | $ 263.0
Minimum [Member] |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |
Tax loss and credit carryforwards, expiration dates | Dec. 31, 2018 |  |  |  |
Maximum [Member] |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |
Tax loss and credit carryforwards, expiration dates | Dec. 31, 2037 |  |  |  |

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