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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, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Net Loss [1] $ 23.0 $ 16.0
Prior Service Credit (28.3) (36.3)
Total Unrecognized Postretirement Health and Life Cost $ (5.3) $ (20.3)
[1] Excludes gains, losses and contributions associated with irrevocable grantor trusts.