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Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Utility Customer Receivables | $ 6.2 | $ 129.3 |
DOE pro-rata share of Cooperative Agreement funding | 17.5 | 20.1 |
Contract Services Billed Revenue | 16.2 | 15.7 |
Contract Services Unbilled Revenue | 2.7 | 1.9 |
Contract Services Customer Receivables | 18.9 | 17.6 |
Accounts Receivable, Gross, Current | 42.6 | 167.0 |
Allowance for Doubtful Accounts Receivable | 4.6 | 4.0 |
Accounts Receivable, Net | 38.0 | 163.0 |
Accounts Receivable, Gross, Noncurrent |  |  | 38.0
Government [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Doubtful Accounts Receivable | 55.0 | 55.0 |
Accounts Receivable, Gross, Noncurrent | 80.8 | 80.8 |
Accounts Receivable, Net, Noncurrent | $ 25.8 | $ 25.8 |

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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) -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 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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