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Accumulated Other Comprehensive Loss - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 2,601.1 $ 2,363.0
Other comprehensive (loss) income, net of tax 3.2 7.2
Ending Balance 2,358.3 2,430.7
Foreign Currency Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 5.8 (28.0)
Amounts classified into accumulated other comprehensive (income) loss (0.8) 6.8
Other comprehensive (loss) income, net of tax (0.8) 6.8
Ending Balance 5.0 (21.2)
Derivative Hedging Gains (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (2.4) (0.6)
Amounts classified into accumulated other comprehensive (income) loss 3.5 1.6
Amounts reclassified from accumulated other comprehensive loss 0.3 0.6
Other comprehensive (loss) income, net of tax 3.8 2.2
Ending Balance 1.4 1.6
Defined benefit plan items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] (42.6) (43.3)
Amounts classified into accumulated other comprehensive (income) loss [1] 0.2  
Amounts reclassified from accumulated other comprehensive loss [1]   (1.8)
Other comprehensive (loss) income, net of tax [1] 0.2 (1.8)
Ending Balance [1] (42.4) (45.1)
Accumulated Other Comprehensive (Loss) Income [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (39.2) (71.9)
Amounts classified into accumulated other comprehensive (income) loss 2.9 8.4
Amounts reclassified from accumulated other comprehensive loss 0.3 (1.2)
Other comprehensive (loss) income, net of tax 3.2 7.2
Ending Balance $ (36.0) $ (64.7)
[1] See Note 12, "Defined Benefit Plans," for further information on the adjustments related to defined benefit plans.