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Accumulated Other Comprehensive Loss - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 2,363.0 $ 2,453.8
Other comprehensive (loss) income, net of tax 46.4 0.3
Ending Balance 2,545.9 2,360.2
Foreign Currency Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (28.0) (13.3)
Amounts classified into accumulated other comprehensive loss 47.0 0.9
Other comprehensive (loss) income, net of tax 47.0 0.9
Ending Balance 19.0 (12.4)
Derivative Hedging Gains (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (0.6) 2.1
Amounts classified into accumulated other comprehensive loss 0.6 (7.3)
Amounts reclassified from accumulated other comprehensive loss (0.6) 2.8
Other comprehensive (loss) income, net of tax   (4.5)
Ending Balance (0.6) (2.4)
Defined benefit plan items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] (43.3) (41.3)
Amounts classified into accumulated other comprehensive loss [1] 3.5 9.0
Amounts reclassified from accumulated other comprehensive loss [1] (4.1) (5.1)
Other comprehensive (loss) income, net of tax [1] (0.6) 3.9
Ending Balance [1] (43.9) (37.4)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (71.9) (52.5)
Amounts classified into accumulated other comprehensive loss 51.1 2.6
Amounts reclassified from accumulated other comprehensive loss (4.7) (2.3)
Other comprehensive (loss) income, net of tax 46.4 0.3
Ending Balance $ (25.5) $ (52.2)
[1] See Note 11, "Defined Benefit Plans," for further information on the adjustments related to defined benefit plans.