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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Premium finance advances and loans | $ 305.5 | $ 241.2
Accrued supplemental, direct bill and other receivables | 154.6 | 177.2
Refined coal production related receivables | 156.8 | 136.9
Prepaid expenses | 91.5 | 78.4
Total other current assets | $ 708.4 | $ 633.7

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