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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Other Tax Expense (Benefit) [Line Items] |  |  |  |  |
Effective income tax rate | 21.50% | 14.30% | 20.10% | 17.60% |
Federal statutory income tax rate |  |  | 21.00% | 35.00% |
Excess tax benefits | $ (1.9) |  | $ 5.4 | $ 6.9 |
Discrete tax benefit related to TCJA | (1.7) |  | 4.8 |  |
Release of valuation allowances | 1.2 |  | 7.3 | 10.8 |
Provisional tax expense related to transition tax on foreign earnings |  |  |  |  | $ 429.2
Provisional tax benefit related to remeasurement of deferred tax balances |  |  |  |  | $ 62.3
Discrete tax benefit related to one-time transition tax |  |  | 2.8 |  |
Discrete tax benefit related to other provisions of TCJA |  |  | 2.0 |  |
Income tax expense on global intangible low-taxed income | 1.1 |  | 7.2 |  |
Foreign accrual to return adjustment |  |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |  |
Other tax expense (benefit) | $ (2.0) |  | (2.0) |  |
Gain on sale of business |  |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |  |
Other tax expense (benefit) |  |  | 42.0 |  |
Tax accounting method change |  |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |  |
Other tax expense (benefit) |  |  | $ (8.0) |  |
Foreign rate changes |  |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |  |
Other tax expense (benefit) |  |  |  | 14.8 |
Out-of-period adjustments |  |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |  |
Other tax expense (benefit) |  |  |  | $ 5.1 |

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