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Cash, Cash Equivalents and Restricted Cash (Tables) | 9 Months Ended
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Sep. 30, 2018
Cash, Cash Equivalents and Restricted Cash [Abstract] |
Schedule of Cash and Cash Equivalents | The following table summarizes the Company’s cash, cash equivalents and restricted cash as presented on the unaudited condensed consolidated balance sheet to amounts on the condensed consolidated statement of cash flows (in millions):
| September 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 124.9 |  |  | $ | 208.8 |
Deposits for financial assurance - current | 30.2 |  |  | 16.3 |
Deposits for financial assurance - noncurrent | 6.2 |  |  | 19.7 |
Total cash, cash equivalents and restricted cash | $ | 161.3 |  |  | $ | 244.8 |
Restrictions on Cash and Cash Equivalents | The following table provides additional detail regarding the Company’s deposits for financial assurance (in millions):
| September 30, 2018 |  | December 31, 2017
| Current |  | Long-Term |  | Current |  | Long-Term
NRC license | $ | 16.3 |  |  | $ | — |  |  | $ | 16.1 |  |  | $ | — |
DOE lease | 13.7 |  |  | — |  |  | — |  |  | 13.5 |
Workers compensation | — |  |  | 5.9 |  |  | — |  |  | 5.9 |
Other | 0.2 |  |  | 0.3 |  |  | 0.2 |  |  | 0.3 |
Total deposits for financial assurance | $ | 30.2 |  |  | $ | 6.2 |  |  | $ | 16.3 |  |  | $ | 19.7 |

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