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Transition Charges (Narrative)(Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Direct charges | $ 3.9 | $ 14.3 | $ 8.6 | $ 49.2 |
Operating expenses | 3.9 | 8.7 | 8.3 | 35.7 |
Inventory Valuation Adjustments |  | 5.1 | 0.3 | 11.7 |
Accelerated property, plant and equipment expenses |  | $ 0.5 |  | $ 1.8 |
Restructuring Liability Balance | $ 2.4 |  | 2.4 |  | $ 2.4
DOE Share of Paducah Termination Benefit Costs |  |  | (0.3) |  |
Special charges for workforce reductions and advisory costs |  |  | 3.5 |  |
Cash Payable [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
One-time termination benefit costs |  |  | 3.8 |  |
Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Payments for one-time termination benefits |  |  | $ (3.8) |  |

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