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Other Financial Data - Summary of Major Classes of Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 445.3	$ 509.7
Accrued supplemental, direct bill and other receivables	558.4	563.0
Refined coal production related receivables	5.9	76.9
Deferred contract costs	79.4	129.7
Prepaid expenses	183.5	171.7
Total other current assets	$ 1,272.5	$ 1,451.0

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