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Transition Charges (Schedule of Restructuring and Related Costs)(Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Restructuring and Related Activities [Abstract]
Restructuring liability	$ 2.4
Termination benefit costs	13.6
Payments for one-time termination benefits	(6.7)
Restructuring liability	9.3
DOE Share of Paducah Termination Benefit Costs	(0.3)
Special charges for workforce reductions	$ 13.3

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DOE Share of Paducah Termination Benefit Costs

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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