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Other Financial Data - Summary of Major Classes of Other Current Assets (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Premium finance advances and loans | $ 527.2 | $ 509.7
Accrued supplemental, direct bill and other receivables | 768.8 | 563.0
Refined coal production related and other receivables | 7.6 | 76.9
Deferred contract costs | 86.3 | 129.7
Prepaid expenses | 173.9 | 171.7
Total other current assets | $ 1,563.8 | $ 1,451.0

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