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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Included in Computation of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Prior Service Costs        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax $ 0.2 $ 0.2 $ 0.3 $ 0.4
Actuarial Losses        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax (0.7) 0.3 (1.3) 0.6
Employee Pension and Postretirement Benefits, Net of Tax        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax (0.5) 0.5 (1.0) 1.0
Tax expense (benefit) 0.1 (0.1) 0.2 (0.2)
Net of tax $ (0.4) $ 0.4 $ (0.8) $ 0.8