v3.25.2
Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income            
Beginning balance $ 1,461.8 $ 1,428.6 $ 1,413.9 $ 1,409.7 $ 1,428.6 $ 1,409.7
Other comprehensive income before reclassifications 10.0   (8.3)   22.9 (12.1)
Net current-period other comprehensive income (loss) 0.4   0.2   1.0 0.5
Net current-period other comprehensive income (loss) 10.4 13.5 (8.1) (3.5) 23.9 (11.6)
Ending balance 1,496.1 1,461.8 1,430.4 1,413.9 1,496.1 1,430.4
Total            
Accumulated Other Comprehensive Income            
Beginning balance (51.9) (65.4) (25.7) (22.2) (65.4) (22.2)
Net current-period other comprehensive income (loss) 10.4 13.5 (8.1) (3.5)    
Ending balance (41.5) (51.9) (33.8) (25.7) (41.5) (33.8)
Unrealized Translation Adjustments            
Accumulated Other Comprehensive Income            
Beginning balance 7.5 (5.4) 20.3 24.1 (5.4) 24.1
Other comprehensive income before reclassifications 10.0   (8.3)   22.9 (12.1)
Net current-period other comprehensive income (loss) 0.0   0.0   0.0 0.0
Net current-period other comprehensive income (loss) 10.0   (8.3)   22.9 (12.1)
Ending balance 17.5 7.5 12.0 20.3 17.5 12.0
Pension Plans            
Accumulated Other Comprehensive Income            
Beginning balance (59.4) (60.0) (46.0) (46.3) (60.0) (46.3)
Other comprehensive income before reclassifications 0.0   0.0   0.0 0.0
Net current-period other comprehensive income (loss) 0.4   0.2   1.0 0.5
Net current-period other comprehensive income (loss) 0.4   0.2   1.0 0.5
Ending balance $ (59.0) $ (59.4) $ (45.8) $ (46.0) $ (59.0) $ (45.8)