Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the condensed consolidated statements of operations	$ 0.1	$ 0.3	$ (0.6)	$ 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	(1.6)	13.3	(1.7)	17.6
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	$ 1.7	$ (13.0)	$ 1.1	$ (16.7)