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Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Charges |  |  |  | $ 19.8 |  |  |  |  |  |  | $ 19.8 |  |
Inventory Valuation Adjustments |  |  |  |  |  |  |  |  |  |  | 25.0 |  |
Non-production expenses |  |  |  |  |  |  |  |  |  |  | 194.2 | 18.8 |
Site expenses |  |  |  |  |  |  |  |  |  |  | 103.0 |  |
Power Contract Losses |  |  |  |  |  |  |  |  |  |  | 11.8 |  |
Accelerated property, plant and equipment expenses |  |  |  |  |  |  |  |  |  |  | 19.4 | 5.6 |
Net defined benefit plan costs for former Portsmouth employees |  |  |  |  |  |  |  |  |  |  | 8.9 | 13.2 |
One-time termination benefit costs |  |  |  |  |  |  |  |  |  |  | 24.0 | 3.9 |
Payments for one-time termination benefits |  |  |  |  |  |  |  |  |  |  | (13.9) | (11.7) |
Restructuring Liability Balance | 22.4 |  |  |  | 0.1 |  |  |  |  |  | 22.4 | 0.1 |
DOE Share of Paducah Termination Benefit Costs |  |  |  |  |  |  |  |  |  |  | (1.2) |  |
Structuring advisory costs |  |  |  |  |  |  |  |  |  |  | 11.0 | 8.4 |
Curtailment (gain) loss |  |  |  |  |  |  |  |  | 1.9 | 3.2 |  |  |
Special charges for workforce reductions and advisory costs | 47.6 | 3.5 | 3.7 | 2.4 | 1.2 | 1.5 | 3.2 | 6.4 |  |  | 57.2 | 12.3 | 0
Uranium Market Conditions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory Valuation Adjustments |  |  |  |  |  |  |  |  |  |  | 15.2 |  |
Residual Uranium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory Valuation Adjustments |  |  |  |  |  |  |  |  |  |  | 22.7 |  |
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 |  |  |  |  |  |  |  |  |  |  | 3.2 |  |
DOE Share of Paducah Termination Benefit Costs |  |  |  |  |  |  |  |  |  |  | 1.2 |  |
Workforce Reduction Phase Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
One-time termination benefit costs |  |  |  |  |  |  |  |  |  |  | 20.8 |  |
DOE Share of Paducah Termination Benefit Costs |  |  |  |  |  |  |  |  |  |  | 5.0 |  |
Cash Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
One-time termination benefit costs |  |  |  |  |  |  |  |  |  |  | 25.2 | 3.4 |
Noncash [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
One-time termination benefit costs |  |  |  |  |  |  |  |  |  |  |  | 0.5 |
Special charges for workforce reductions and advisory costs |  |  |  |  |  |  |  |  |  |  | 22.2 |  |
Severance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for one-time termination benefits |  |  |  |  |  |  |  |  |  |  | (4.0) | (3.4) |
Restructuring Liability Balance | 21.2 |  |  |  | 0 |  |  |  |  |  | 21.2 | 0 |
Advisory Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for one-time termination benefits |  |  |  |  |  |  |  |  |  |  | (9.9) | (8.3) |
Restructuring Liability Balance | $ 1.2 |  |  |  | $ 0.1 |  |  |  |  |  | $ 1.2 | $ 0.1 |

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