Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes
Effective tax rate	35.30%	31.70%		45.60%	43.50%
Tax charge related to recently enacted health care legislation			$ 2.3
Unrecognized tax benefits resulting in the reversal of accrued liability	1.1	2.2
Effective tax rate excluding discrete items	37.70%		42.60%	37.60%	42.60%
Charge due to the matter discussed	5.9			5.9
Income tax receivables	10.6			10.6		41.2
Liability for unrecognized tax benefits	18.2			18.2		15.9
Accrued interest and penalties	$ 6.5			$ 6.5		$ 6.1

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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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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- Definition

This element represents the total of accruals as of the date of the statement of financial position for interest recognized 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 and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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