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Special Charges (Schedule of Restructuring and Related Costs)(Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring liability		$ 12.1	$ 21.2	$ 2.4
Termination benefit costs	$ 8.7	3.7	4.5	13.6
Payments for one-time termination benefits		(13.4)	(13.6)	(7.3)
Restructuring liability		2.4	12.1	8.7
DOE Share of Paducah Termination Benefit Costs		(1.6)	(2.4)	(0.4)
Special charges for workforce reductions		$ 2.1	$ 2.1	$ 13.2

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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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