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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Premium finance advances and loans $ 316.2 $ 305.5
Accrued supplemental, direct bill and other receivables 348.2 244.5
Refined coal production related receivables 160.2 156.8
Deferred contract costs 91.6 83.3
Prepaid expenses 108.2 91.5
Total other current assets $ 1,024.4 $ 881.6 [1]
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.