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Other Financial Data - Summary of Major Classes of Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 511.8	$ 442.7
Accrued supplemental, direct bill and other receivables	546.2	361.7
Refined coal production related receivables	108.5	95.4
Deferred contract costs	76.3	102.0
Prepaid expenses	126.7	112.1
Total other current assets	$ 1,369.5	$ 1,113.9

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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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