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Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Line of Credit Facility [Abstract] |
Schedule of Credit Facility |
| December 31,
| 2013 |  | 2012
| (millions)
Borrowings under the revolving credit facility | $ | — |  |  | $ | — |
Term loan | — |  |  | 83.2 |
Letters of credit | 1.6 |  |  | 14.7 |
Available credit | — |  |  | 87.1 |
Summary of Deferred Financing Costs |
| Dec. 31, 2011 |  | Additions |  | Reductions |  | Dec. 31, 2012 |  | Additions/ (Reclasses) |  | Reductions |  | Dec. 31, 2013
Other current assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Bank credit facilities | $ | 2.4 |  |  | $ | 9.2 |  |  | $ | (8.6 | ) |  | $ | 3.0 |  |  | $ | 2.2 |  |  | $ | (5.2 | ) |  | $ | — |
Convertible notes | — |  |  | — |  |  | — |  |  | — |  |  | 1.8 |  |  | (0.2 | ) |  | 1.6 |
Other long-term assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes | 5.5 |  |  | — |  |  | (1.9 | ) |  | 3.6 |  |  | (1.8 | ) |  | (1.8 | ) |  | — |
DOE Loan Guarantee application | 6.7 |  |  | — |  |  | (6.7 | ) |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 14.6 |  |  | $ | 9.2 |  |  | $ | (17.2 | ) |  | $ | 6.6 |  |  | $ | 2.2 |  |  | $ | (7.2 | ) |  | $ | 1.6 |

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Summary of Deferred Financing Costs + References No definition available. + Details
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