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Financial Instruments - Effect of the Company's Derivative Instruments on Net Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest Rate Products [Member]
       
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) $ (1.5) $ (4.0) $ 11.1 $ (10.3)
Interest Expense [Member]
       
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into (Income) Loss, (Effective Portion) $ (0.1) $ 0.4 $ (0.3) $ 0.2