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Employee Benefits - Amounts Recognized on the Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |
Pension and OPEB assets | $ 881.3 | $ 600.9
Pension and OPEB obligations | 219.0 | 327.0
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension and OPEB assets | 389.0 | 182.9
Pension and OPEB obligations | 196.7 | 304.3
Total net (liabilities) assets | 192.3 | (121.4)
OPEB Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension and OPEB assets | 492.3 | 418.0
Pension and OPEB obligations | 22.3 | 22.7
Total net (liabilities) assets | $ 470.0 | $ 395.3

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