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Accumulated Other Comprehensive Loss - After-Tax Components of and Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 2,601.1 $ 2,363.0
Other comprehensive (loss) income, net of tax (14.0) 17.3
Ending Balance 2,174.7 2,568.7
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) (17.1) 17.7
Other comprehensive (loss) income, net of tax (17.1) 17.7
Ending Balance (11.3) (10.3)
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) 2.9 3.3
Amounts reclassified from accumulated other comprehensive loss   (0.5)
Other comprehensive (loss) income, net of tax 2.9 2.8
Ending Balance 0.5 2.2
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]   (3.2)
Other comprehensive (loss) income, net of tax [1] 0.2 (3.2)
Ending Balance [1] (42.4) (46.5)
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) (14.0) 21.0
Amounts reclassified from accumulated other comprehensive loss   (3.7)
Other comprehensive (loss) income, net of tax (14.0) 17.3
Ending Balance $ (53.2) $ (54.6)
[1] See Note 12, "Defined Benefit Plans," for further information on the adjustments related to defined benefit plans.