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Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |  | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2012 | Jun. 30, 2014 Cash Payable [Member] | Dec. 31, 2013 Cash Payable [Member] | Dec. 31, 2013 Severance [Member] | Jun. 30, 2014 Severance [Member] | Dec. 31, 2013 Noncash [Member] | Jun. 30, 2014 Advisory Costs [Member] | Dec. 31, 2013 Advisory Costs [Member] | Dec. 31, 2012 Advisory Costs [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory Valuation Adjustments | $ 5.1 | $ 10.0 | $ 11.7 | $ 10.0 |  |  |  |  |  |  |  |  |  |  |
Non-production expenses | 14.3 | 70.0 | 49.2 | 75.7 |  |  |  |  |  |  |  |  |  |  |
Site expenses | 8.7 | 23.4 | 35.7 | 26.4 |  |  |  |  |  |  |  |  |  |  |
Accelerated property, plant and equipment expenses | 0.5 | 5.5 | 1.8 | 8.2 |  |  |  |  |  |  |  |  |  |  |
Asset retirement charges |  | 19.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Power contract losses |  | 11.8 |  | 11.8 |  |  |  |  |  |  |  |  |  |  |
One-time termination benefit costs | 4.1 |  | 4.2 |  |  | 29.4 |  | 4.2 | 25.2 |  |  |  |  |  |
Payments for one-time termination benefits |  |  | (13.0) |  | (13.9) |  |  |  |  | (4.0) | (11.8) |  | (1.2) | (9.9) |
DOE Share of Paducah Termination Benefit Costs | (1.6) |  | (2.2) |  | (1.2) | (3.4) |  |  |  |  |  |  |  |  |
Structuring advisory costs |  |  |  | 4.7 | 11.0 |  |  |  |  |  |  |  |  |  |
Restructuring Liability Balance | 13.6 |  | 13.6 |  | 22.4 | 13.6 | 0.1 |  |  | 21.2 | 13.6 |  |  | 1.2 | 0.1
Restructuring Charges | 2.5 | 3.7 | 2.0 | 6.1 | 57.2 |  |  |  |  |  |  | 22.2 |  |  |
Reorganization items, advisory fees | $ 4.7 |  | $ 11.9 |  |  |  |  |  |  |  |  |  |  |  |

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