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Accumulated Other Comprehensive Loss - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 2,453.8 $ 2,263.1 $ 2,653.1
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (3.8) (4.6)  
Other comprehensive (loss) income, net of tax (19.4) (45.8) (102.2)
Ending Balance 2,363.0 2,453.8 2,263.1
Foreign Currency Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (13.3) 31.0 53.3
Amounts classified into accumulated other comprehensive (loss) income (14.7) (44.3) (20.8)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings     (1.5)
Other comprehensive (loss) income, net of tax (14.7) (44.3) (22.3)
Ending Balance (28.0) (13.3) 31.0
Derivative Hedging Losses (Gains) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 2.1 (0.6) 0.9
Amounts classified into accumulated other comprehensive (loss) income (6.2) 4.5 (1.5)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings 3.5 (1.8)  
Other comprehensive (loss) income, net of tax (2.7) 2.7 (1.5)
Ending Balance (0.6) 2.1 (0.6)
Defined benefit plan items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (41.3) (37.1) 41.2
Amounts classified into accumulated other comprehensive (loss) income 5.3 (1.4) (69.7)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (7.3) (2.8) (8.6)
Other comprehensive (loss) income, net of tax (2.0) (4.2) (78.3)
Ending Balance (43.3) (41.3) (37.1)
Accumulated Other Comprehensive (Loss) Income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (52.5) (6.7) 95.4
Amounts classified into accumulated other comprehensive (loss) income (15.6) (41.2) (92.0)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (3.8) (4.6) (10.1)
Other comprehensive (loss) income, net of tax (19.4) (45.8) (102.1)
Ending Balance $ (71.9) $ (52.5) $ (6.7)