Advanced Technology Costs and Other Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	23 Months Ended
Sep. 30, 2014	Sep. 30, 2014	Apr. 30, 2014
ACTDO DOE Funding – Increment 1		$ 33.7
RD&D Program Funding by DOE			79.50%
RD&D Program Funding by USEC			20.50%
RD&D Program Qualifying Expenditures - Total	352.2	352.2
RD&D Program Qualifying Expenditures - DOE Share Total	280	280
RD&D Program Qualifying Expenditures – USEC Share Total	72.2	72.2
Advanced technology costs	5.3	12.3
Scenario, Forecast [Member]
Maximum RD&D Program Funding by DOE			$ 280
RD&D Program Funding by DOE			80.00%
RD&D Program Funding by USEC			20.00%

- Definition

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.

+ References+ Details