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Employee Benefit Plans - Amounts Recognized in the Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Noncurrent assets | $ 20.2 | $ 21.2
Liability, Defined Benefit Pension Plan, Current | (8.0) | (6.6)
Defined benefit pension plan, liabilities, noncurrent | (141.2) | (118.2)
Defined benefit plan, amounts recognized in balance sheet | (129.0) | (103.6)
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Noncurrent assets | 0.0 | 0.0
Postemployment Benefits Liability, Current | (29.8) | (29.1)
Other postretirement defined benefit plan, liabilities, noncurrent | (556.7) | (520.0)
Other postretirement defined benefit plan, liabilities | $ (586.5) | $ (549.1)

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