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Other Financial Data - (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Premium finance advances and loans | $ 388.1 | $ 316.2
Accrued supplemental, direct bill and other receivables | 369.1 | 348.2
Refined coal production related receivables | 103.4 | 160.2
Deferred contract costs | 98.3 | 91.6
Prepaid expenses | 115.5 | 108.2
Total other current assets | $ 1,074.4 | $ 1,024.4

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