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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 18.8	$ 4.3	$ (43.5)	$ 8.2
Effective income tax rate	44.80%	12.70%	33.20%	20.20%
Recognized tax benefit	24.7		24.7
Continuing Operations [Member]
Income Tax Contingency [Line Items]
Recognized tax benefit	$ 16.3		$ 16.3

- Definition

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

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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