Gains and Losses on Derivatives Designated as Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments Gain Loss [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion)	$ 0	$ (0.1)	$ (0.6)
Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion)	(0.7)	(2.4)	(3.2)
Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0	0	0
Cash Flow Hedging | Interest rate swaps
Derivative Instruments Gain Loss [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion)	0	(0.1)	(0.6)
Cash Flow Hedging | Interest income (expense), net
Derivative Instruments Gain Loss [Line Items]
Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion)	(0.7)	(2.4)	(3.0)
Cash Flow Hedging | N/A
Derivative Instruments Gain Loss [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 0	$ 0	$ 0