Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Current Assets - Components of Prepaid Expenses and Other Current Assets (Detail)

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Prepaid Expenses and Other Current Assets - Components of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Workers’ compensation plan deposits $ 3.1 $ 3.8
Prepaid insurance 2.4 1.9
Derivative contract assets 0.4 2.0
Other 4.3 4.0
Total prepaid expenses and other current assets $ 10.2 $ 11.7