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Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 292.5	$ 241.2
Accrued supplemental, direct bill and other receivables	172.4	177.2
Refined coal production related receivables	125.7	136.9
Prepaid expenses	89.0	78.4
Total other current assets	$ 679.6	$ 633.7

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Accrued Supplemental Direct Bill And Other Receivables Current

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 310
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49354-109356

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Amount of current assets classified as other.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6787-107765

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