v3.26.1
Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ (71.0)      
Net current-period other comprehensive income (loss) (3.4) $ 4.3    
Ending balance (74.4)      
Stockholders' Equity Attributable to Parent 1,434.5 1,202.4 $ 1,382.0 $ 1,186.1
Actuarial Losses        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive loss before reclassifications 0.0 (0.3)    
Amounts reclassified from accumulated other comprehensive loss 0.6 0.5    
Net current-period other comprehensive income (loss) 0.6 0.2    
Stockholders' Equity Attributable to Parent (60.8) (62.3) (61.4) (62.5)
Prior Service Costs        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive loss before reclassifications 0.0 0.0    
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0    
Net current-period other comprehensive income (loss) 0.0 0.0    
Stockholders' Equity Attributable to Parent (1.8) (1.8) (1.8) (1.8)
Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive loss before reclassifications (4.0) 4.0    
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0    
Net current-period other comprehensive income (loss) (4.0) 4.0    
Stockholders' Equity Attributable to Parent (11.8) (20.5) (7.8) (24.5)
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive loss before reclassifications (4.0) 3.8    
Amounts reclassified from accumulated other comprehensive loss 0.6 0.5    
Net current-period other comprehensive income (loss) (3.4) 4.3    
Stockholders' Equity Attributable to Parent (74.4) (84.7) (71.0) (89.0)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive loss before reclassifications 0.0 0.1    
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0    
Net current-period other comprehensive income (loss) 0.0 0.1    
Stockholders' Equity Attributable to Parent $ 0.0 $ (0.1) $ 0.0 $ (0.2)