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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,038.0  
Other comprehensive income before reclassifications     (1.8) $ (37.1)
Amounts reclassified from AOCL     (0.9) 0.7
Total other comprehensive income/(loss) $ (8.2) $ (16.2) (2.7) (36.4)
Ending Balance 1,125.4   1,125.4  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (145.2) (46.9)
Ending Balance (147.9) (83.3) (147.9) (83.3)
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (58.4) 10.7
Other comprehensive income before reclassifications     0.0 0.0
Amounts reclassified from AOCL     (0.9) 0.7
Total other comprehensive income/(loss)     (0.9) 0.7
Ending Balance (59.3) 11.4 (59.3) 11.4
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (86.8) (57.6)
Other comprehensive income before reclassifications     (1.8) (37.1)
Amounts reclassified from AOCL     0.0 0.0
Total other comprehensive income/(loss)     (1.8) (37.1)
Ending Balance $ (88.6) $ (94.7) $ (88.6) $ (94.7)