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Financial Instruments - Effect of Company's Derivative Instruments on Net Loss and Income (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest rate products [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, (Loss) Gain Recognized in Other Comprehensive (Income) Loss, Effective Portion $ (8.3) $ (3.6) $ 10.2
Interest expense [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, (Loss) Gain Reclassified from Accumulated OCI into Income, Effective Portion $ (0.9) $ (0.1) $ 0.4