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Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Workforce Reduction Phase One [Member] | Mar. 31, 2014 Cash Payable [Member] | Dec. 31, 2013 Cash Payable [Member] | Mar. 31, 2014 Severance [Member] | Dec. 31, 2013 Severance [Member] | Dec. 31, 2013 Noncash [Member] | Mar. 31, 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 | $ 6.6 |  |  |  |  |  |  |  |  |  |  |  |
Non-production expenses | 34.9 | 5.8 |  |  |  |  |  |  |  |  |  |  |
Site expenses | 27.0 | 3.0 |  |  |  |  |  |  |  |  |  |  |
Accelerated property, plant and equipment expenses | 1.3 | 2.8 |  |  |  |  |  |  |  |  |  |  |
One-time termination benefit costs |  |  | 24.0 |  |  | 0.1 | 25.2 |  |  |  |  |  |
Payments for one-time termination benefits | (3.9) |  | (13.9) |  |  |  |  | (2.7) | (4.0) |  | (1.2) | (9.9) |
DOE Share of Paducah Termination Benefit Costs | (0.6) |  | (1.2) |  | (1.2) |  |  |  |  |  |  |  |
Structuring advisory costs |  | 2.4 | 11.0 |  |  |  |  |  |  |  |  |  |
Restructuring Liability Balance | 18.6 |  | 22.4 | 0.1 |  |  |  | 18.6 | 21.2 |  |  | 1.2 | 0.1
Restructuring Charges | (0.5) | 2.4 | 57.2 |  |  |  |  |  |  | 22.2 |  |  |
Reorganization items, advisory fees | $ 7.2 |  |  |  |  |  |  |  |  |  |  |  |

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