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Special Charges (Schedule of Restructuring and Related Costs)(Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Restructuring liability				$ 8.7				$ 2.4	$ 8.7	$ 2.4
Termination benefit costs			$ 0.1			$ 8.7			0.4
Payments for one-time termination benefits									(3.6)	(6.9)
Restructuring liability	$ 5.5				$ 8.7				5.5	8.7
DOE Share of Paducah Termination Benefit Costs										(0.4)
Special charges for workforce reductions	$ 0.2	$ 0.6	$ 0.6	$ 0.0	$ (0.1)	$ 9.8	$ 2.9	$ 0.6	$ 1.4	$ 13.2

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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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