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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Premium finance advances and loans | $ 246.8 | $ 305.5 |
Accrued supplemental, direct bill and other receivables | 229.7 | 244.5 |
Refined coal production related receivables | 128.8 | 156.8 |
Contract costs | 48.9 | 83.3 |
Prepaid expenses | 95.0 | 91.5 |
Total other current assets | $ 749.2 | $ 881.6 | [1]
[1] | See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.

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