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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 825.0  
Other comprehensive income before reclassifications     (15.5)  
Amounts reclassified from AOCL     (0.6)  
Total other comprehensive loss $ (12.8) $ (1.4) (16.1) $ (10.8)
Ending Balance 881.8   881.8  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (75.7)  
Ending Balance (91.8)   (91.8)  
Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1.5  
Other comprehensive income before reclassifications     (1.5)  
Amounts reclassified from AOCL     (0.0)  
Total other comprehensive loss     (1.5)  
Ending Balance 0.0   0.0  
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (18.1)  
Other comprehensive income before reclassifications     0.0  
Amounts reclassified from AOCL     (0.6)  
Total other comprehensive loss     (0.6)  
Ending Balance (18.7)   (18.7)  
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (59.1)  
Other comprehensive income before reclassifications     (14.0)  
Amounts reclassified from AOCL     (0.0)  
Total other comprehensive loss     (14.0)  
Ending Balance $ (73.1)   $ (73.1)