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Income Taxes (Narrative) (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	Dec. 31, 2010
Income Taxes
Income tax expense	$ 54.8	$ 55.5	$ 104.3	$ 104.0
Tax expense, percentage of pre-tax income	31.80%	38.50%	32.00%	37.40%
Federal statutory tax rate	35.00%		35.00%
Total gross unrecognized tax benefits	86.2		86.2		78.9
Unrecognized tax benefits, period increase			7.3
Unrecognized tax benefits that would reduce company's effective tax rate	81.9		81.9		74.7
Gross interest related to unrecognized tax benefits accrued	$ 6.6		$ 6.6		$ 5.5

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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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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