Derivatives - Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Derivative Instruments Gain Loss [Line Items]
Total ineffectiveness recognized	$ 0.1	$ 0.3
Interest Rate Swap | Investment and other expense (income)-net | Designated Fair Value Hedges
Derivative Instruments Gain Loss [Line Items]
Total ineffectiveness recognized	(0.6)	(3.2)
Hedged Items | Investment and other expense (income)-net | Designated Fair Value Hedges
Derivative Instruments Gain Loss [Line Items]
Total ineffectiveness recognized	$ 0.7	$ 3.5