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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Company's effective tax rate	28.00%	28.00%
Liability for unrecognized tax benefits	$ 44.2	$ 44.2	$ 45.0
Liability for unrecognized tax benefits that would impact the effective tax rate, if recognized	34.7	34.7
Accrued interest on liability for unrecognized tax benefits	5.4	5.4	5.0
Expected decrease in unrecognized tax benefits within next 12 months	$ 3.1	$ 3.1

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position 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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