Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Oct. 31, 2015
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Loss from discontinued operations	$ 0.0		$ (7.4)	$ (0.4)	$ (6.9)
Lahnstein Mill | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Cash proceeds from sale of business						$ 5.4
Purchase price		$ 0.5
Transaction costs				0.6
Loss on settlement of liabilities, net of tax				$ 0.4
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Net sales			12.2		38.8
Cost of products sold			11.5		35.5
Gross profit			0.7		3.3
Selling, general and administrative expenses and other expenses			0.9		2.9
(Loss) Income from discontinued operations before income taxes			(0.2)		0.4
Loss on sale			(6.9)		(6.9)
Loss before income taxes			(7.1)		(6.5)
Income tax provision			0.3		0.4
Loss from discontinued operations			$ (7.4)		(6.9)
Selected cash flow information for discontinued operations
Depreciation and amortization					2.5
Capital expenditures					$ 0.4