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Other Financial Data - (Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 342.6	$ 388.1
Accrued supplemental, direct bill and other receivables	289.1	369.1
Refined coal production related receivables	88.3	103.4
Deferred contract costs	70.1	98.3
Prepaid expenses	94.1	115.5
Total other current assets	$ 884.2	$ 1,074.4

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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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