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Accounts Receivable (Tables) | 9 Months Ended
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Sep. 30, 2013
Accounts Receivable, Net, Current [Abstract] |
Schedule of Accounts Receivable |
| September 30, 2013 |  | December 31, 2012
| (millions)
Utility customers | $ | 121.3 |  |  | $ | 118.3 |
DOE pro-rata share of RD&D program funding | 24.8 |  |  | 4.4 |
Contract services, primarily DOE: |  |  |  |  |
Billed revenue | 9.7 |  |  | 10.5 |
Unbilled revenue | 2.9 |  |  | 1.6 |
| 12.6 |  |  | 12.1 |
Current accounts receivable, net | $ | 158.7 |  |  | $ | 134.8 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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