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Other Financial Data - (Other Current Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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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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