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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate | 14.70% | 22.40% |
Federal statutory income tax rate | 21.00% | 35.00% |
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 | 3.7 |  |
Income tax expense on global intangible low-taxed income | $ 3.0 |  |

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