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Notional Amounts of Derivative Financial Instruments and Related Fair Values Measured on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Notional amount of derivatives $ 191.7 $ 338.0
Total derivative financial instruments, fair value (net) (5.4) (6.4)
Designated as Hedging Instrument | Interest rate swap contract
   
Derivatives, Fair Value [Line Items]    
Notional Amounts of Derivative Instruments, Liability 180.6 186.3
Designated as Hedging Instrument | Interest rate swap contract | Other non-current liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of Derivative Instruments, Liability (5.8) (4.6)
Designated as Hedging Instrument | Foreign exchange contracts
   
Derivatives, Fair Value [Line Items]    
Notional Amounts of Derivative Instruments, Asset 6.4 0
Designated as Hedging Instrument | Foreign exchange contracts | Prepaid expenses and other [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0.1 0
Not Designated as Hedging Instrument | Interest rate swap contract
   
Derivatives, Fair Value [Line Items]    
Notional Amounts of Derivative Instruments, Liability 0 140.0
Not Designated as Hedging Instrument | Interest rate swap contract | Accrued expense
   
Derivatives, Fair Value [Line Items]    
Fair value of Derivative Instruments, Liability 0 (0.8)
Not Designated as Hedging Instrument | Foreign exchange contracts
   
Derivatives, Fair Value [Line Items]    
Notional Amounts of Derivative Instruments, Liability   11.7
Notional Amounts of Derivative Instruments, Asset 4.7  
Not Designated as Hedging Instrument | Foreign exchange contracts | Accrued expense
   
Derivatives, Fair Value [Line Items]    
Fair value of Derivative Instruments, Liability   (1.0)
Not Designated as Hedging Instrument | Foreign exchange contracts | Prepaid expenses and other [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 0.3