ENVIRONMENTAL REMEDIATION LIABILITIES - Schedule of Total Environmental Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Total environmental liabilities	$ 32.3	$ 33.5
Other Long-term Liabilities
Loss Contingencies [Line Items]
Total environmental liabilities	27.8	28.2
Accrued Liabilities
Loss Contingencies [Line Items]
Total environmental liabilities	$ 4.5	$ 5.3

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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