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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, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 1,147.1  
Other comprehensive income before reclassifications (7.3) $ 4.7
Amounts reclassified from AOCL 0.0 (0.3)
Total other comprehensive income/(loss) (7.3) 4.4
Ending Balance 1,183.6  
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (148.1) (145.2)
Ending Balance (155.4) (140.8)
Defined Benefit Pension Plan Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (77.2) (58.4)
Other comprehensive income before reclassifications 0.0 0.0
Amounts reclassified from AOCL 0.0 (0.3)
Total other comprehensive income/(loss) 0.0 (0.3)
Ending Balance (77.2) (58.7)
Foreign Currency Translation Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (70.9) (86.8)
Other comprehensive income before reclassifications (7.3) 4.7
Amounts reclassified from AOCL 0.0 0.0
Total other comprehensive income/(loss) (7.3) 4.7
Ending Balance $ (78.2) $ (82.1)