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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,032.4  
Other comprehensive income before reclassifications     (20.7) $ (7.5)
Amounts reclassified from AOCL     0.5 1.3
Total other comprehensive (loss)/income $ (16.6) $ 4.4 (20.2) (6.2)
Ending Balance 1,067.9   1,067.9  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (46.9) (57.3)
Ending Balance (67.1) (63.5) (67.1) (63.5)
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     0.5 1.3
Total other comprehensive (loss)/income     0.5 1.3
Ending Balance 11.2 (18.6) 11.2 (18.6)
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (57.6) (37.4)
Other comprehensive income before reclassifications     (20.7) (7.5)
Amounts reclassified from AOCL     0.0 0.0
Total other comprehensive (loss)/income     (20.7) (7.5)
Ending Balance $ (78.3) $ (44.9) $ (78.3) $ (44.9)