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Pension and Other Postretirement Benefits - PBO in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]    
Projected benefit obligations $ 25.2 $ 26.2
Accumulated benefit obligations 26.1 26.2
Fair value of plan assets $ 3.6 $ 3.6