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Income Taxes - Quarterly Disclosure (Details9) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
[IncomeTaxExpenseBenefitAbstract]
Income tax expense	$ 3.7	$ 25.8
Income Tax Reconciliation Other Adjustments	$ (2.0)	$ (3.7)
EffectiveIncomeTaxRateContinuingOperations	37.60%
EffectiveIncomeTaxRateExcludingDiscreteTaxAdjustmentsInPeriod	24.20%	30.70%

- 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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