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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 825.0  
Other comprehensive income before reclassifications     (2.8)  
Amounts reclassified from AOCL     (0.5)  
Total other comprehensive income/(loss) $ 2.4 $ (16.9) (3.3) $ (9.4)
Ending Balance 862.7   862.7  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (75.7)  
Ending Balance (79.0)   (79.0)  
Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1.5  
Other comprehensive income before reclassifications     (1.2)  
Amounts reclassified from AOCL     (0.0)  
Total other comprehensive income/(loss)     (1.2)  
Ending Balance 0.3   0.3  
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     (0.5)  
Total other comprehensive income/(loss)     (0.5)  
Ending Balance (18.6)   (18.6)  
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (59.1)  
Other comprehensive income before reclassifications     (1.6)  
Amounts reclassified from AOCL     (0.0)  
Total other comprehensive income/(loss)     (1.6)  
Ending Balance $ (60.7)   $ (60.7)