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Accumulated Other Comprehensive Income (Loss) - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income        
Actuarial losses $ (1.9) $ 0.3 $ (4.3) $ (1.7)
Tax expense (14.7) (9.1) (17.0) (19.8)
Net income 8.2 27.5 22.8 78.9
Reclassification Out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income        
Total before tax 0.3 0.2 1.1 0.5
Tax expense 0.0 0.0 (0.2) (0.1)
Net income 0.3 0.2 0.9 0.4
Reclassification Out of Accumulated Other Comprehensive Income | Actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income        
Actuarial losses $ 0.3 $ 0.2 $ 1.1 $ 0.5