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Other Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2021
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, |
|  | 2021 |  |  | 2020 |
Premium finance advances and loans |  | $ | 509.7 |  |  | $ | 442.7 |
Accrued supplemental, direct bill and other receivables |  |  | 563.0 |  |  |  | 361.7 |
Refined coal production related receivables |  |  | 76.9 |  |  |  | 95.4 |
Deferred contract costs |  |  | 129.7 |  |  |  | 102.0 |
Prepaid expenses |  |  | 171.7 |  |  |  | 112.1 |
Total other current assets |  | $ | 1,451.0 |  |  | $ | 1,113.9 |

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