Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Components of Accrued Liabilities (Detail)

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Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Compensation and benefits $ 16.4 $ 19.2
Workers’ compensation 3.1 2.9
Utilities 2.6 2.4
Professional fees 1.6 1.6
Taxes 1.3 1.4
Insurance 1.0 1.9
Derivative contract liabilities 0.1 0.2
Other 4.5 6.4
Total accrued liabilities $ 30.6 $ 36.0