Derivatives - Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the condensed consolidated statements of operations	$ (0.2)		$ (0.8)	$ 0.9
Interest Rate Swap | Investment and other (income) expense-net
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the condensed consolidated statements of operations	1.3	(0.6)	(0.4)	17.0
Hedged Items | Investment and other (income) expense-net
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the condensed consolidated statements of operations	$ (1.5)	$ 0.6	$ (0.4)	$ (16.1)