Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss carryforwards	$ 383.0	$ 366.9
Alternative minimum tax credits	10.2	11.8
Repurchase reserve		0.2
Inventories	1.2	0.4
Compensation	3.4	1.1
Pension benefits	6.9	5.7
Intangible assets	13.1
Other	1.7	2.1
Total deferred tax assets	419.5	388.2
Deferred tax valuation allowance	(406.0)	(382.4)	$ (385.6)	$ (375.0)
Deferred tax assets, net of valuation allowance	13.5	5.8
Deferred tax liabilities:
Property, plant and equipment	(11.5)	(11.4)
Intangible assets	(3.0)	(1.1)
Other	(1.5)
Total deferred tax liabilities	(16.0)	(12.5)
Net deferred tax liabilities	$ (2.5)	$ (6.7)