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Derivative Instruments and Hedging Activities - Impact of Rights of Offset Associated with Recognized Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Current Asset [Member]
 
Derivative Instruments And Hedging Activities [Line Items]  
Fair Value of Derivative Instruments, Assets With Effects of Netting $ 16.6
Fair Value of Derivative Instruments, Assets Effect of Netting (0.2)
Fair Value of Derivative Instruments, Assets Without Netting 16.4
Long-term assets [Member]
 
Derivative Instruments And Hedging Activities [Line Items]  
Fair Value of Derivative Instruments, Assets With Effects of Netting 6.5
Fair Value of Derivative Instruments, Assets Effect of Netting 0
Fair Value of Derivative Instruments, Assets Without Netting 6.5
Current liabilities [Member]
 
Derivative Instruments And Hedging Activities [Line Items]  
Fair Value of Derivative Instruments, Liabilities With Effects of Netting (0.2)
Fair Value of Derivative Instruments, Liabilities Effect of Netting 0.2
Fair Value of Derivative Instruments, Liabilities Without Netting 0
Long-term liabilities [Member]
 
Derivative Instruments And Hedging Activities [Line Items]  
Fair Value of Derivative Instruments, Liabilities With Effects of Netting 0
Fair Value of Derivative Instruments, Liabilities Effect of Netting 0
Fair Value of Derivative Instruments, Liabilities Without Netting $ 0