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Financial Instruments - Effect of Company's Derivative Instruments on Net Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Interest Rate Products [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) $ 10.9 $ (7.6) $ 12.6 $ (6.3)
Interest Expense [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into (Income) Loss, (Effective Portion) $ (0.1) $ (0.2) $ (0.2) $ (0.2)