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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes
Effective income tax rate (as a percent)	25.40%	27.30%	25.30%	26.60%
Unrecognized tax benefits including interest and penalties	$ 52.3		$ 52.3
Portion of unrecognized amount, expected to be recognized upon settlement of tax examinations and the expiration of various statutes of limitation within next twelve months	$ 11.2		$ 11.2

- 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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