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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
Effective tax rate (as a percent)	29.20%	31.90%
Income tax provisions	$ 17.9	$ 18.4
Reconciliation of provision for income taxes at U.S. federal statutory income tax rate to effective income tax rate
Percentage reduction in the rate due to benefit from the extension of the 2012 and 2013 U.S. Research & Development tax credits	1.00%

- 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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