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Summary of Components of Interest as Presented in Consolidated Statements of Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Income	$ 1.2	$ 1.3
Expense on borrowings	(21.0)	(16.4)
Income (expense) on UTPs and other tax related liabilities	(2.2)	5.0
Legacy Tax	0	0
Capitalized	0	(0.2)
Total	$ (22.0)	$ (10.3)

This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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