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Pension Benefits - Changes in Fair Value of Pension Plans Level 3 (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plans’ Assets at Beginning of Year | $ 405.4 | $ 664.6
Fair Value of Plan Assets at End of Year | 391.7 | 405.4
Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plans’ Assets at Beginning of Year | 0.0 |
Fair Value of Plan Assets at End of Year | $ 0.0 | $ 0.0

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