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Fair Value Measurement - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value Measurements [Line Items]            
Proceeds from interest rate swap   $ 60        
Restructuring reserves 68.9 70.6 68.9 70.7 75.8 32.3
Asset impairment charges 0   0      
Fair Value
           
Fair Value Measurements [Line Items]            
Restructuring reserves $ 68.9   $ 68.9