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Commitment and Contingencies (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies |  |  |  |  |  |  |
Minimum Power Purchase Obligation | $ 200,000,000 |  |  |  | $ 200,000,000 |  |
Amount of application under DOE Loan Guarantee Program | 2,000,000,000 |  |  |  | 2,000,000,000 |  |
Potential financing from Japanese export credit agencies under discussion | 1,000,000,000 |  |  |  | 1,000,000,000 |  |
Other (income) | (47,500,000) | (34,600,000) | (10,000,000) | (3,700,000) | (92,100,000) | (3,700,000) | (44,400,000)
Contingent commercial ACP license royalty limit |  |  |  |  | $ 665,000,000 |  |

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