Derivatives - Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the Condensed Consolidated Statements of Operations	$ 0.2	$ (0.2)
Interest Rate Swap | Investment and other expense-net
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the Condensed Consolidated Statements of Operations	(2.6)	(2.3)
Hedged Items | Investment and other expense-net
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the Condensed Consolidated Statements of Operations	$ 2.8	$ 2.1