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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Abstract]
Effective income tax rate	33.00%	32.80%
Unrecognized tax benefits	$ 189.5
Unrecognized tax benefits that would impact effective tax rate	$ 67.1

- 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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