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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Effective income tax rate, continuing operations	26.00%	26.00%
Tax benefit of project termination settlement	$ 3.8
Tax benefit associated with retirement obligations	2.1
Other Tax Adjustments	1.7
Tax benefit of research and development and international tax credit extensions	6.6
Tax impact of other tax adjustments	$ 4.9

- 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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