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Deferred Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Deferred Income Taxes [Abstract]
Valuation allowances against deferred tax assets	$ 2.6		$ 2.6		$ 2.4
Net deferred tax asset	$ 22.3		$ 22.3		$ 18.5
Effective income tax rate	41.00%	12.00%	40.00%	36.00%

- 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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