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Fair Value Measurements and Other Financial Instruments - Fair Value Hierarchy of Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash equivalents $ 7.0 $ 64.7
Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash equivalents 7.0 64.7
Foreign Currency Forward Contracts [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) (2.4) (22.4)
Foreign Currency Forward Contracts [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) (2.4) (22.4)
Foreign Currency Option Contracts [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) 0.1  
Foreign Currency Option Contracts [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) 0.1  
Interest Rate and Currency Swap [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) 40.9 17.8
Interest Rate and Currency Swap [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) 40.9 $ 17.8
Cross-Currency Swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) (22.2)  
Cross-Currency Swaps [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative financial instruments net asset (liability) $ (22.2)