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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 - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Projected Benefit Obligation $ 746.3 $ 739.7
Accumulated Benefit Obligation 729.5 724.5
Fair Value of Plan Assets $ 589.0 $ 568.6