Discontinued Operations (Details) - Lahnstein Mill € in Millions, $ in Millions		12 Months Ended
Oct. 31, 2015 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2015 EUR (€)
Disposal Groups, Including Discontinued Operations
Cash proceeds from sale of mill	$ 5.4				€ 50
Pension and related liabilities of discontinued operations	$ 21.0
Selected financial information for discontinued operations
Loss on sale		$ (0.8)	$ 0.0	$ (0.6)
Loss before income taxes		(0.8)	0.0	(0.6)
Income tax provision (benefit)		0.0	0.0	(0.2)
Loss from discontinued operations		$ (0.8)	$ 0.0	$ (0.4)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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