Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Detail)

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Accrued Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Compensation and benefits $ 23.4 $ 21.1
Workers’ compensation 2.7 2.9
Utilities 2.7 2.4
Professional fees 1.8 1.6
Taxes 1.2 1.4
Derivative contract liabilities 0.9 0.2
Other 7.5 6.4
Total accrued liabilities $ 40.2 $ 36.0