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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income                
Actuarial losses $ (2.4)     $ (1.1)     $ (6.6) $ (8.7)
Tax expense (10.5)     (4.2)     (27.4) (15.7)
Net income 21.6 $ 26.4 $ 24.5 19.8 $ 26.7 $ 12.5 72.5 59.0
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)                
Reclassification Adjustment out of Accumulated Other Comprehensive Income                
Total before tax 0.6     0.4     1.8 1.2
Tax expense (0.1)     0.0     (0.3) (0.3)
Net income 0.5     0.4     1.5 0.9
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Actuarial losses                
Reclassification Adjustment out of Accumulated Other Comprehensive Income                
Actuarial losses $ 0.6     $ 0.4     $ 1.8 $ 1.2