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Pension and Other Postretirement Benefit Plans - Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension [Member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Projected Benefit Obligation $ 911.7 $ 965.7
Accumulated Benefit Obligation 875.5 931.2
Fair Value of Plan Assets $ 745.7 $ 759.4