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Transition Charges (Narrative)(Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Direct charges	$ 23.9	$ 17.5	$ 32.5	$ 66.7
Operating expenses	2.3	15.6	10.6	51.3
Inventory valuation adjustments		1.8	0.3	13.5
Plant asset depreciation charges		$ 0.1		$ 1.9
Termination benefit costs			13.6
DOE Share of Paducah Termination Benefit Costs			0.3
Cost of Sales [Member]
Actuarial (gain) loss from remeasurement, net	21.6		21.6
Contract Reduction [Member]
Termination benefit costs	8.7
Other Restructuring [Member]
Termination benefit costs	$ 1.1		$ 4.9

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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