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Income Taxes, Additional Disclosures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 Federal	Dec. 31, 2012 Federal
Income Tax Disclosure [Abstract]
Effective income tax rate	40.80%	27.10%
Federal income tax refund received			$ 58.1	$ 66.8

- 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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