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Sale of NAC Subsidiary (Tables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Contract services revenue	$ 2.6	$ 4.1
Contract services costs	3.3	4.1
Gross profit	13.3	36.7
Advanced technology costs	59.3	36.7
Selling, general and administrative	12.9	13.6
Operating income	(13.7)	(20.0)
Gain on sale of subsidiary	(35.6)
Segment, Discontinued Operations [Member]
Contract services revenue	13.7	19.5
Contract services costs	11.8	17.4
Gross profit	1.9	2.1
Advanced technology costs		0.1
Selling, general and administrative	1.8	1.3
Operating income	0.1	0.7
Gain on sale of subsidiary	35.6
Income before income taxes	35.7	0.7
Provision for income taxes	14.0	0.2
Net income from discontinued operations	$ 21.7	$ 0.5

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Costs incurred and are directly related to generating contract revenues.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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