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Derivative and Fair Value Measurements - Location and Fair Value Amount of Derivative Instruments Reported in Consolidated Balance Sheet (Detail) (Derivatives not designated as hedging instruments under ASC 815 [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value   $ 0.2
Liability Derivatives, Fair Value 0.3  
Commodity Contract [Member] | Prepaid Expenses And Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value   0.2
Commodity Contract [Member] | Other Accrued Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value $ 0.3