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Pension and Other Postretirement Benefit Plans - Unrecognized Postretirement Health and Life Costs (Details) - Postretirement Health and Life [Member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Net (Gain) Loss [1] $ (12.7) $ 23.0
Prior Service Credit (20.7) (28.3)
Total Unrecognized Postretirement Health and Life Cost $ (33.4) $ (5.3)
[1] Excludes gains, losses and contributions associated with irrevocable grantor trusts.