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Accumulated Other Comprehensive Loss - Components of and Changes in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 2,453.8 $ 2,263.1
Amounts reclassified from accumulated other comprehensive loss $ (0.6) $ (2.7) (1.7) (5.3)
Net current-period other comprehensive income (loss)     13.2 (17.8)
Ending Balance 2,282.6 2,369.8 2,282.6 2,369.8
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (13.3)  
Amounts classified into accumulated other comprehensive loss     15.0  
Net current-period other comprehensive income (loss)     15.0  
Ending Balance 1.7   1.7  
Derivative Hedging Gain Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     2.1  
Amounts classified into accumulated other comprehensive loss     (6.8)  
Amounts reclassified from accumulated other comprehensive loss     1.6  
Net current-period other comprehensive income (loss)     (5.2)  
Ending Balance (3.1)   (3.1)  
Defined benefit plan items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance [1]     (41.3)  
Amounts classified into accumulated other comprehensive loss [1]     6.7  
Amounts reclassified from accumulated other comprehensive loss (2.4) (2.2) (3.3) [1] (4.3)
Net current-period other comprehensive income (loss) [1]     3.4  
Ending Balance [1] (37.9)   (37.9)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (52.5) (6.7)
Amounts classified into accumulated other comprehensive loss     14.9  
Amounts reclassified from accumulated other comprehensive loss     (1.7)  
Net current-period other comprehensive income (loss)     13.2 (17.8)
Ending Balance $ (39.3) $ (24.5) $ (39.3) $ (24.5)
[1] See Note 11, "Defined Benefit Plans," for further information on the adjustments related to defined benefit plans.