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Advanced Technology Costs and Other Income (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Research and Development [Abstract]
Maximum RD&D Program Funding by DOE				$ 280.0
RD&D Program Funding by DOE				80.00%
Other advanced technology costs	$ 1.9	$ 5.3	$ 7.7	$ 12.3

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- Definition

Maximum RD&D Program Funding by DOE

+ References

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- Definition

RD&D Program Funding by DOE

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Amount of other research and development expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 730



-SubTopic 10



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

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