Derivatives - Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Derivative Instruments Gain Loss [Line Items]
Total ineffectiveness recognized	$ 0.2
Interest Rate Swap | Investment and other expense (income)-net
Derivative Instruments Gain Loss [Line Items]
Total ineffectiveness recognized	(2.6)
Hedged Items | Investment and other expense (income)-net
Derivative Instruments Gain Loss [Line Items]
Total ineffectiveness recognized	$ 2.8