Restructuring Costs (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 plant	Dec. 31, 2019 USD ($)
2016 Program | Finishing [Member]
Restructuring Cost and Reserve [Line Items]
Number of plants eliminated | plant	2
Other costs
Restructuring Cost and Reserve [Line Items]
Cost expected to be incurred | $		$ 1.4