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, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the Condensed Consolidated Statements of Operations	$ 0.1	$ (0.2)	$ 0.3	$ (0.4)
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	(0.6)	0.9	(3.2)	(1.4)
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	$ 0.7	$ (1.1)	$ 3.5	$ 1.0