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Other Financial Data - (Other Current Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Premium finance advances and loans $ 305.1 $ 316.2
Accrued supplemental, direct bill and other receivables 306.3 348.2
Refined coal production related receivables 114.0 160.2
Deferred contract costs 55.1 91.6
Prepaid expenses 95.0 108.2
Total other current assets $ 875.5 $ 1,024.4