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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Expenditure	$ 2.7	$ 2.6	$ 2.0
Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Accretion expense recognized	3.4
Remediation charge for changes in the scope and cost of future remediation activities	$ 1.3
Discount rate of remediation provision	8.92%
Expenditure	$ 2.7	$ 2.6	$ 2.0

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- Definition

Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

+ References

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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