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Employee Benefits (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Retirement Benefits, Description [Abstract] |  |  |
Number of participants domestic pension plan | 3,500 |  |
Number of participants postretirement benefit plan | 1,700 |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Deferred compensation liability | $ 96.2 | $ 92.4 |
Deferred compensation expense | 11.2 | 9.7 | $ 6.3
Deferred benefit liability | 117.0 | 129.1 |
Deferred benefit expense | 7.3 | 8.8 | $ 9.7
Cash surrender value of life insurance | 177.4 | 171.5 |
Deferred compensation plan assets | 15.9 | 12.9 |
Long-Term Disability Plan [Abstract] |  |  |
Long-term disability plan obligation | 8.4 | $ 8.2 |
Long term disability plan, income replacement benefit obligation | $ 0.0 |  |

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