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Employee Benefits - Accumulated Benefit Obligations (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 2,992.9 | $ 2,804.9
Information for pension plans with an accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 1,810.1 | 1,930.8
Accumulated benefit obligation | 1,754.2 | 1,882.2
Fair value of plan assets | $ 1,504.6 | $ 1,572.7

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