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Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Utility Customer Receivables | $ 129.3 | $ 118.3
DOE pro-rata share of RD&D program funding | 20.1 | 4.4
Contract Services Billed Revenue | 15.7 | 12.6
Contract Services Unbilled Revenue | 1.9 | 1.6
Contract Services Customer Receivables | 17.6 | 14.2
Accounts Receivable, Gross, Current | 167.0 | 136.9
Allowance for Doubtful Accounts Receivable | 4.0 | 2.1
Accounts Receivable, Net, Current | 163.0 | 134.8
Accounts Receivable, Gross, Noncurrent |  | 38.0
Government [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for Doubtful Accounts Receivable | 55.0 | 12.2
Accounts Receivable, Gross, Noncurrent | 80.8 | 38.0
Accounts Receivable, Net, Noncurrent | $ 25.8 | $ 25.8

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