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Effective Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Effective income tax rate	32.30%	34.40%
One hundred percent valuation allowance	100.00%
Reversal of valuation allowance	$ 26.2	$ 26.2
Tax contingency reserve	$ 19.5	$ 19.5

- 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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