Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets, Net [Abstract]
Accounts receivable allowances	$ 0.0	$ 0.4
Inventories	1.9	3.7
Compensation and employee benefits	1.5	3.9
Tax credit carryforwards	23.9	28.4
Net operating loss carryforwards	190.9	278.6
Accrued liabilities and other reserves	2.1	6.1
Pension	6.7	8.6
Property, plant and equipment	(0.1)
Property, plant and equipment		0.5
Intangible assets, net	0.3	0.0
Capital losses	9.4	14.1
Other, net	1.3	1.3
Total deferred tax assets	237.9	345.6
Valuation allowance	(237.9)	(340.5)
Net deferred tax assets	0.0	5.1
Intangible assets, net	0.0	(1.2)
Unremitted earnings of foreign subsidiaries	(1.0)	(6.1)
Total deferred tax liabilities	(1.0)	(7.3)
Valuation allowance	0.0	1.2
Total deferred tax liabilities	(1.0)	(6.1)
Net deferred tax liabilities	$ (1.0)	$ (1.0)