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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 [Abstract]
Effective income tax rate (in hundredths)	44.30%	50.90%
Tax rate excluding the impact of the 2012 WOTC, restructuring charges and the French business tax (in hundredths)	32.00%	38.00%
U.S. Federal statutory rate (in hundredths)	35.00%
Expected annual effective income tax rate	approximately 40%
Gross unrecognized tax benefits, including interest and penalties	$ 28.6		$ 28.5
Related tax benefits	2.5		2.5
Net unrecognized tax benefits	$ 26.1		$ 26.0

X

- Definition

A ratio calculated by dividing the expected annual income tax expense attributable to continuing operations by GAAP-basis forecast pretax income from continuing operations. This ratio represents the effective income tax rate that the Company expects to realize for the fiscal year, as of the balance sheet date.

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Represents the income tax rate excluding the impact of the 2012 United States Federal Work Opportunity Credit (WOTC), restructuring charges and the French business tax.

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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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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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