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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |
Company contributions | $ 59.8 | $ 35.9 | $ 28.9
Deferred compensation plan amounts owed, non current | 60.8 | 59.5 |
Deferred compensation plan amounts owed | $ 62.9 | $ 61.5 |

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