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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract] |  |  |
Company contributions | $ 28.9 | $ 30.3 | $ 26.4
Deferred Compensation Liability, Current and Noncurrent | 53.8 | 48.7 |
Deferred compensation plan amounts owed | $ 51.0 | $ 44.5 |

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