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Accumulated Other Comprehensive Loss - Components of and Changes in Accumulated Other Comprehensive Loss (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance $ (6.7)
Amounts classified into accumulated other comprehensive loss (12.5)
Amounts reclassified from accumulated other comprehensive loss (5.3)
Net current-period other comprehensive loss (17.8)
Ending Balance (24.5)
Foreign Currency Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance 31.0
Amounts classified into accumulated other comprehensive loss (13.7)
Net current-period other comprehensive loss (13.7)
Ending Balance 17.3
Derivative Hedging Losses [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (0.6)
Amounts classified into accumulated other comprehensive loss 1.2
Amounts reclassified from accumulated other comprehensive loss (1.0)
Net current-period other comprehensive loss 0.2
Ending Balance (0.4)
Defined Benefit Plan Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance [1] (37.1)
Amounts reclassified from accumulated other comprehensive loss [1] (4.3)
Net current-period other comprehensive loss [1] (4.3)
Ending Balance [1] $ (41.4)
[1] See Note 11, "Defined Benefit Plans," for further information on the adjustments related to defined benefit plans.