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Other Current Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
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):
|  | September 30, 2017 |  |  | December 31, 2016 |
Premium finance advances and loans |  | $ | 292.5 |  |  | $ | 241.2 |
Accrued supplemental, direct bill and other receivables |  |  | 172.4 |  |  |  | 177.2 |
Refined coal production related receivables |  |  | 125.7 |  |  |  | 136.9 |
Prepaid expenses |  |  | 89.0 |  |  |  | 78.4 |
Total other current assets |  | $ | 679.6 |  |  | $ | 633.7 |

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