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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income        
Other expense $ (0.6) $ (2.6) $ (2.4) $ (2.0)
Tax expense 5.8 (7.5) (2.3) (10.7)
Net income (loss) (22.8) 34.3 14.6 51.4
Reclassification Out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income        
Total before tax 0.4 0.2 0.8 0.3
Tax expense (0.1) (0.1) (0.2) (0.1)
Net income (loss) 0.3 0.1 0.6 0.2
Reclassification Out of Accumulated Other Comprehensive Income | Actuarial gains        
Reclassification Adjustment out of Accumulated Other Comprehensive Income        
Other expense $ 0.4 $ 0.2 $ 0.8 $ 0.3