Income Taxes - Deferred Income Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets
Income tax loss carryforwards	$ 15.4	$ 24.1
Other accrued liabilities	3.4	3.5
Employee benefits related	2.6	2.5
Property, plant and equipment	1.3	1.4
Insurance related	0.9	1.2
Goodwill	0.6	0.7
Inventories	1.2	1.0
Accounts receivables	0.2	0.3
Other, assets	0.3	0.1
Gross deferred tax assets	25.9	34.8
Valuation allowance	(6.4)	(7.2)
Deferred Tax Assets, Total	19.5	27.6
Liabilities
LIFO	8.6	8.0
Other, liabilities	0.6	0.5
Gross deferred tax liabilities	9.2	8.5
Deferred Tax Liabilities, Total	$ 9.2	$ 8.5