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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 1,211.2  
Other comprehensive income/(loss) before reclassifications 56.0 $ 2.7
Amounts reclassified from AOCL 0.0 0.1
Total other comprehensive income/(loss) 56.0 2.8
Ending Balance 1,297.0  
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (91.0) (148.1)
Ending Balance (35.0) (145.3)
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 0.1
Total other comprehensive income/(loss) 0.0 0.1
Ending Balance 0.0 (77.1)
Foreign Currency Translation Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (91.0) (70.9)
Other comprehensive income/(loss) before reclassifications 56.0 2.7
Amounts reclassified from AOCL 0.0 0.0
Total other comprehensive income/(loss) 56.0 2.7
Ending Balance $ (35.0) $ (68.2)