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Other Financial Data - Summary of Major Classes of Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 470.3	$ 509.7
Accrued supplemental, direct bill and other receivables	758.9	563.0
Refined coal production related and other receivables	6.4	76.9
Deferred contract costs	93.2	129.7
Prepaid expenses	173.9	171.7
Total other current assets	$ 1,502.7	$ 1,451.0

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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of current assets classified as other.

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