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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, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Income	$ 1.6	$ 1.2
Expense on borrowings	(26.1)	(21.0)
Income (expense) on UTPs and other tax related liabilities	0.6	(2.2)
Capitalized	0.1	0
Total	$ (23.8)	$ (22.0)

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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