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Derivative Instruments and Hedging Activities - Derivative Instruments Designated as Fair Value Hedges (Detail) - Interest Rate Swaps [Member] - Interest Expense [Member]
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Gain (Loss) on Instrument $ 10.8
Gain (Loss) on Hedged Item $ (10.8)