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Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset Retirement Charges |  |  | $ 19.3 |
Inventory Valuation Adjustments | 5.0 |  | 15.0 |
Non-production expenses | 47.7 | 6.1 | 123.4 | 12.7
Site expenses | 37.4 |  | 63.8 |
Power Contract Losses |  |  | 11.8 |
Accelerated property, plant and equipment expenses | 5.3 | 2.8 | 13.5 | 2.8
Net defined benefit plan costs for former Portsmouth employees |  | 3.3 | 7.5 | 9.9
One-time termination benefit costs | 1.5 | 0.4 | 3.6 | 4.0
DOE Share of Paducah Termination Benefit Costs | 6.0 |  |  |
Structuring advisory costs | 2.0 | 1.1 | 6.7 | 7.1
Curtailment (gains) | 0.7 |  |  |
Minimum [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Estimated Total Paducah Termination Benefit Costs | 23 |  |  |
Maximum [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Estimated Total Paducah Termination Benefit Costs | 27 |  |  |
Uranium Market Conditions [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory Valuation Adjustments |  |  | 5.0 |
Residual Uranium [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory Valuation Adjustments |  |  | 7.7 |
Materials and Supplies [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory Valuation Adjustments |  |  | 2.3 |
Workforce Reduction Phase One [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
One-time termination benefit costs |  |  | 2.0 |
Payments for one-time termination benefits |  |  | 2.5 |
DOE Share of Paducah Termination Benefit Costs |  |  | 0.7 |
Workforce Reduction Phase Two [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
One-time termination benefit costs | 1.6 |  |  |
DOE Share of Paducah Termination Benefit Costs | 0.5 |  |  |
Workforce Reduction Phase Two [Member] | Minimum [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Estimated Near-Term Termination Benefit Costs | 1.6 |  |  |
Workforce Reduction Phase Two [Member] | Maximum [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Estimated Near-Term Termination Benefit Costs | $ 2.4 |  |  |

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