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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Premium finance advances and loans $ 257.0 $ 241.2
Accrued supplemental, direct bill and other receivables 181.4 177.2
Refined coal production related receivables 147.0 136.9
Prepaid expenses 78.7 78.4
Total other current assets $ 664.1 $ 633.7