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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income tax expense	$ 2.2	$ 2.1
Effective income tax rate, continuing operations	4.30%	5.40%
Income tax benefit, release of prior period unrecognized tax benefit	1.1
Income tax expense, foreign withholding taxes paid	$ 0.7

- 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 sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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