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Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset Retirement Charges | $ 19.3 |  | $ 19.3 |
Inventory Valuation Adjustments |  |  | 10.0 |
Inventory Valuation Adjustments, Uranium |  |  | 7.7 |
Site Expenses - Other Operating Costs |  |  | 20.1 |
Power Contract Losses |  |  | 11.8 |
Accelerated propery, plant and equipment expenses |  |  | 8.2 |
Net defined benefit plan costs for former Portsmouth employees |  |  | 6.3 | 6.6
One-time termination benefit costs | 2.1 | 1.7 |  | 3.6
DOE Share of Paducah Termination Benefit Costs | 6.0 |  |  |
Structuring advisory costs | 2.3 | 1.5 | 4.7 | 6.0
Curtailment (gains) | 0.7 |  |  |
Minimum [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Estimated Near-Term Termination Benefit Costs | 2.1 |  |  |
Estimated Total Paducah Termination Benefit Costs | 25.0 |  |  |
Maximum [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Estimated Near-Term Termination Benefit Costs | 7.5 |  |  |
Estimated Total Paducah Termination Benefit Costs | $ 30.0 |  |  |

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