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Pension and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total recognized in other comprehensive (income) loss, after taxes $ (22.4) $ 6.6 $ 7.9
Pensions      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year net actuarial loss (gain) (12.2) 22.1  
Amortization of net actuarial (loss) gain (15.5) (12.4)  
Amortization of prior service (cost) credit (0.1) (0.2)  
Settlement loss (0.1) (0.5)  
Total recognized in other comprehensive (income) loss, before taxes (27.9) 9.0  
Total recognized in other comprehensive (income) loss, after taxes (22.8) 7.2  
Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year net actuarial loss (gain) (1.4) (1.7)  
Amortization of net actuarial (loss) gain 1.0 0.8  
Amortization of prior service (cost) credit 0.0 0.0  
Settlement loss 0.0 0.0  
Total recognized in other comprehensive (income) loss, before taxes (0.4) (0.9)  
Total recognized in other comprehensive (income) loss, after taxes $ (0.3) $ (1.1)