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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, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 1,147.1  
Other comprehensive income before reclassifications 2.7 $ (1.8)
Amounts reclassified from AOCL 0.1 (0.9)
Total other comprehensive income/(loss) 2.8 (2.7)
Ending Balance 1,243.4  
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (148.1) (145.2)
Ending Balance (145.3) (147.9)
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 0.1 (0.9)
Total other comprehensive income/(loss) 0.1 (0.9)
Ending Balance (77.1) (59.3)
Foreign Currency Translation Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (70.9) (86.8)
Other comprehensive income before reclassifications 2.7 (1.8)
Amounts reclassified from AOCL 0.0 0.0
Total other comprehensive income/(loss) 2.7 (1.8)
Ending Balance $ (68.2) $ (88.6)