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Other Financial Data - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 546.3	$ 509.7
Accrued supplemental, direct bill and other receivables	567.8	563.0
Refined coal production related receivables	5.7	76.9
Deferred contract costs	144.5	129.7
Prepaid expenses	197.2	171.7
Total other current assets	$ 1,461.5	$ 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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