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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,032.4  
Other comprehensive income before reclassifications     (37.1) $ (14.5)
Amounts reclassified from AOCL     0.7 1.9
Total other comprehensive loss $ (16.2) $ (6.4) (36.4) (12.6)
Ending Balance 1,089.4   1,089.4  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (46.9) (57.3)
Ending Balance (83.3) (69.9) (83.3) (69.9)
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     10.7 (19.9)
Other comprehensive income before reclassifications     0.0 0.0
Amounts reclassified from AOCL     0.7 1.9
Total other comprehensive loss     0.7 1.9
Ending Balance 11.4 (18.0) 11.4 (18.0)
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (57.6) (37.4)
Other comprehensive income before reclassifications     (37.1) (14.5)
Amounts reclassified from AOCL     0.0 0.0
Total other comprehensive loss     (37.1) (14.5)
Ending Balance $ (94.7) $ (51.9) $ (94.7) $ (51.9)