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Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended |  | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2012 | Sep. 30, 2014 Cash Payable [Member] | Dec. 31, 2013 Cash Payable [Member] | Dec. 31, 2013 Severance [Member] | Sep. 30, 2014 Severance [Member] | Dec. 31, 2013 Noncash [Member] | Sep. 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 | $ 1.8 | $ 5.0 | $ 13.5 | $ 15.0 |  |  |  |  |  |  |  |  |  |  |
Non-production expenses | 17.5 | 47.7 | 66.7 | 123.4 |  |  |  |  |  |  |  |  |  |  |
Site expenses | 15.6 | 37.4 | 51.3 | 63.8 |  |  |  |  |  |  |  |  |  |  |
Accelerated property, plant and equipment expenses |  | 5.3 | 1.9 | 13.5 |  |  |  |  |  |  |  |  |  |  |
Asset retirement charges |  | 19.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Power contract losses |  |  |  | 11.8 |  |  |  |  |  |  |  |  |  |  |
One-time termination benefit costs | 0.3 |  | 4.5 |  |  | 29.7 |  | 4.5 | 25.2 |  |  |  |  |  |
Payments for one-time termination benefits |  |  | (14.8) |  | (13.9) |  |  |  |  | (4.0) | (13.6) |  | (1.2) | (9.9) |
DOE Share of Paducah Termination Benefit Costs | (0.2) |  | (2.4) |  | (1.2) | (3.6) |  |  |  |  |  |  |  |  |
Structuring advisory costs |  |  |  | 6.7 | 11.0 |  |  |  |  |  |  |  |  |  |
Restructuring Liability Balance | 12.1 |  | 12.1 |  | 22.4 |  | 0.1 |  |  | 21.2 | 12.1 |  |  | 1.2 | 0.1
Restructuring Charges |  |  | 2.1 |  | 57.2 |  |  |  |  |  |  | 22.2 |  |  |
Reorganization items, professional fees | $ 10.4 |  | $ 22.3 |  |  |  |  |  |  |  |  |  |  |  |

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