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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes
Effective income tax rate (as a percent)	30.40%	35.00%
Unrecognized income tax benefits	$ 4.2		$ 4.1
Gross unrecognized tax benefits that would impact effective tax rate	3.1		3.0
Unrecognized tax benefits that will be realized in the next twelve months as a result of the expiration of statute limitations	$ 0.3

- 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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