Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments Gain Loss [Line Items]
Total (gain) loss recognized as ineffectiveness in the condensed consolidated statements of operations	$ (0.7)	$ 0.6
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	(0.1)	4.3
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	$ (0.6)	$ (3.7)