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Other Current Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Summary of Major Classes of Other Current Assets | Major classes of other current assets consist of the following (in millions):
|  | March 31, 2018 |  |  | December 31, 2017 |
Premium finance advances and loans |  | $ | 246.8 |  |  | $ | 305.5 |
Accrued supplemental, direct bill and other receivables |  |  | 229.7 |  |  |  | 244.5 |
Refined coal production related receivables |  |  | 128.8 |  |  |  | 156.8 |
Contract costs |  |  | 48.9 |  |  |  | 83.3 |
Prepaid expenses |  |  | 95.0 |  |  |  | 91.5 |
Total other current assets |  | $ | 749.2 |  |  | $ | 881.6 |

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