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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	28.00%	37.00%
Valuation allowances against deferred tax assets	$ 2.3		$ 2.3
Net deferred tax asset	$ 22.5		$ 22.7

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- 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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