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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     $ (89.0)          
Net current-period other comprehensive income (loss) $ (3.3) $ 3.9 14.2 $ (0.2)        
Ending balance (74.8)   (74.8)          
Stockholders' Equity Attributable to Parent 1,321.7 1,149.4 1,321.7 1,149.4 $ 1,262.2 $ 1,186.1 $ 1,099.6 $ 1,001.9
Actuarial Losses                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss) before reclassifications 0.1 (0.8) (0.8) (0.9)        
Amounts reclassified from accumulated other comprehensive loss 0.5 0.6 1.6 1.6        
Net current-period other comprehensive income (loss) 0.6 (0.2) 0.8 0.7        
Stockholders' Equity Attributable to Parent (61.7) (69.0) (61.7) (69.0) (62.3) (62.5) (68.8) (69.7)
Prior Service Costs                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss) before reclassifications 0.1 0.0 (0.1) 0.0        
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.1 0.1        
Net current-period other comprehensive income (loss) 0.1 0.0 0.0 0.1        
Stockholders' Equity Attributable to Parent (1.8) (1.9) (1.8) (1.9) (1.9) (1.8) (1.9) (2.0)
Currency Translation                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss) before reclassifications (4.0) 5.6 13.2 0.3        
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.0 0.0        
Net current-period other comprehensive income (loss) (4.0) 5.6 13.2 0.3        
Stockholders' Equity Attributable to Parent (11.3) (9.8) (11.3) (9.8) (7.3) (24.5) (15.4) (10.1)
Accumulated Other Comprehensive Loss                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss) before reclassifications (3.8) 3.7 12.4 (0.1)        
Amounts reclassified from accumulated other comprehensive loss 0.5 0.2 1.8 (0.1)        
Net current-period other comprehensive income (loss) (3.3) 3.9 14.2 (0.2)        
Stockholders' Equity Attributable to Parent (74.8) (81.5) (74.8) (81.5) (71.5) (89.0) (85.4) (81.3)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss) before reclassifications 0.0 (1.1) 0.1 0.5        
Amounts reclassified from accumulated other comprehensive loss 0.0 (0.4) 0.1 (1.8)        
Net current-period other comprehensive income (loss) 0.0 (1.5) 0.2 (1.3)        
Stockholders' Equity Attributable to Parent $ 0.0 $ (0.8) $ 0.0 $ (0.8) $ 0.0 $ (0.2) $ 0.7 $ 0.5