Discontinued Operations and Assets Held for Sale (Details 2) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2015
Discontinued Operations
Annual sales	$ 230.4	$ 231.6	$ 211.3	$ 214.4	$ 203.6	$ 215.3	$ 214.6	$ 206.2		$ 887.7	$ 839.7	$ 781.7
Selected financial information for discontinued operations
Income (loss) before income taxes									$ 4.2
Income tax provision									$ 1.6
Selected cash flow information of discontinued operations
Depreciation and amortization										2.7	3.9	3.5
Assets Held For Sale
Total Current Assets	246.6				319.1					246.6	319.1
Assets Held for Sale					46.3						46.3
Liabilities Related to Facilities Held for Sale
Liabilities related to facilities held for sale					27.3						27.3
Lahnstein Mill
Discontinued Operations
Cash proceeds from sale of mill	$ 50.0									50.0			$ 5.4
Pension and related liabilities of discontinued operations										21.0
Asset impairment										12.0
Transaction costs										1.7
Selected financial information for discontinued operations
Net sales										43.2	63.0	62.8
Cost of products sold										39.7	56.6	52.9
Gross Profit										3.5	6.4	9.9
Selling, general and administrative expenses										3.5	5.2	4.7
Restructuring costs										0.1	0.6	0.2
Other income - net										(0.3)	(0.3)	(0.4)
Income (Loss) From Discontinued Operations Before Income Taxes										0.2	0.9	5.4
Loss on sale										(13.6)
Income (loss) before income taxes										(13.4)	0.9	5.4
Income tax provision										(4.0)	0.2	1.9
Income (loss) from discontinued operations										(9.4)	0.7	3.5
Selected cash flow information of discontinued operations
Depreciation and amortization										2.7	3.9	3.5
Capital expenditures										$ 0.6	0.7	$ 0.8
Assets Held For Sale
Accounts receivable - net					2.4						2.4
Inventories					10.1						10.1
Prepaid and other current assets					1.4						1.4
Total Current Assets					13.9						13.9
Property, Plant and Equipment					28.3						28.3
Goodwill					1.0						1.0
Intangible Assets-net					2.3						2.3
Other Assets					0.8						0.8
Assets Held for Sale					46.3						46.3
Liabilities Related to Facilities Held for Sale
Accounts payable					2.4						2.4
Accrued expenses					2.0						2.0
Deferred Income Taxes					0.7						0.7
Noncurrent Employee Benefits					22.2						22.2
Liabilities related to facilities held for sale					$ 27.3						$ 27.3