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Other Current Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
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):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Premium finance advances and loans |  | $ | 388.1 |  |  | $ | 316.2 |
Accrued supplemental, direct bill and other receivables |  |  | 369.1 |  |  |  | 348.2 |
Refined coal production related receivables |  |  | 103.4 |  |  |  | 160.2 |
Deferred contract costs |  |  | 98.3 |  |  |  | 91.6 |
Prepaid expenses |  |  | 115.5 |  |  |  | 108.2 |
Total other current assets |  | $ | 1,074.4 |  |  | $ | 1,024.4 |

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