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Employee Benefits (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Retirement Benefits, Description [Abstract] |  |  |
Number of participants domestic pension plan | 3,300 |  |
Number of participants postretirement benefit plan | 1,600 |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Deferred compensation and benefit liability balance | $ 196.2 | $ 213.2 |
Deferred compensation and benefit arrangement expense | 10.0 | 18.5 | $ 18.5
Cash Surrender Value of Life Insurance | 177.3 | 177.4 |
Long-Term Disability Plan [Abstract] |  |  |
Long-term disability plan obligation | 5.9 | $ 8.4 |
Long term disability plan, income replacement benefit obligation | $ 0.0 |  |

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