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Other Financial Data - (Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 340.9	$ 316.2
Accrued supplemental, direct bill and other receivables	368.5	348.2
Refined coal production related receivables	117.4	160.2
Deferred contract costs	64.9	91.6
Prepaid expenses	101.5	108.2
Total other current assets	$ 993.2	$ 1,024.4

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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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