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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income taxes (Textual) [Abstract]
Effective tax rate	40.40%	42.40%	40.90%	41.60%
Expected annualized tax rate			41.00%
Income tax payments	$ 10.8	$ 19.1	$ 11.4	$ 20.5

- 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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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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