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Derivative Instruments and Hedging Activities - Derivative Instruments Designated as Fair Value Hedges (Detail) - Interest Rate Swaps [Member] - Interest Expense [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gain (Loss) on Instrument $ (3.8) $ 10.1
Gain (Loss) on Hedged Item $ 3.8 $ (10.1)