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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 302.8	$ 305.5
Accrued supplemental, direct bill and other receivables	251.9	244.5
Refined coal production related receivables	173.0	156.8
Deferred contract costs	55.0	83.3
Prepaid expenses	95.4	91.5
Total other current assets	$ 878.1	$ 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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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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