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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Company contributions | $ 35.9 | $ 28.9 | $ 30.3
Deferred Compensation Liability, Current and Noncurrent | 61.5 | 53.8 |
Deferred compensation plan amounts owed | $ 59.5 | $ 51.0 |

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