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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 1,211.2  
Other comprehensive income/(loss) before reclassifications 18.7 $ (7.3)
Amounts reclassified from AOCL 0.0 0.0
Total other comprehensive income/(loss) 18.7 (7.3)
Ending Balance 1,260.0  
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (91.0) (148.1)
Ending Balance (72.3) (155.4)
Defined Benefit Pension Plan Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 0.0 (77.2)
Other comprehensive income/(loss) before reclassifications 0.0 0.0
Amounts reclassified from AOCL 0.0 0.0
Total other comprehensive income/(loss) 0.0 0.0
Ending Balance 0.0 (77.2)
Foreign Currency Translation Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (91.0) (70.9)
Other comprehensive income/(loss) before reclassifications 18.7 (7.3)
Amounts reclassified from AOCL 0.0 0.0
Total other comprehensive income/(loss) 18.7 (7.3)
Ending Balance $ (72.3) $ (78.2)