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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 331.9	$ 305.5
Accrued supplemental, direct bill and other receivables	302.7	244.5
Refined coal production related receivables	158.1	156.8
Deferred contract costs	58.9	83.3
Prepaid expenses	99.9	91.5
Total other current assets	$ 951.5	$ 881.6	[1]
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.

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