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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, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 2,363.0 $ 2,453.8
Amounts reclassified from accumulated other comprehensive (income) loss (1.2) (1.1)
Other comprehensive (loss) income, net of tax 7.2 13.6
Ending Balance 2,430.7 2,169.8
Foreign Currency Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (28.0) (13.3)
Amounts classified into accumulated other comprehensive loss 6.8 11.4
Other comprehensive (loss) income, net of tax 6.8 11.4
Ending Balance (21.2) (1.9)
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 1.6 (3.9)
Amounts reclassified from accumulated other comprehensive (income) loss 0.6 (0.2)
Other comprehensive (loss) income, net of tax 2.2 (4.1)
Ending Balance 1.6 (2.0)
Defined benefit plan items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (43.3) (41.3)
Amounts classified into accumulated other comprehensive loss   7.2
Amounts reclassified from accumulated other comprehensive (income) loss (1.8) (0.9)
Other comprehensive (loss) income, net of tax (1.8) 6.3
Ending Balance (45.1) (35.0)
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 8.4 14.7
Amounts reclassified from accumulated other comprehensive (income) loss (1.2) (1.1)
Other comprehensive (loss) income, net of tax 7.2 13.6
Ending Balance $ (64.7) $ (38.9)