Restructuring (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6,300,000	$ 23,500,000	$ 25,000,000.0
Restructuring liability	0	0
Expected restructuring costs remaining	0
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	100,000	1,600,000	1,300,000
Selling, technical, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,200,000	21,900,000	23,700,000
Electronics
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,900,000	17,300,000	13,700,000
Industrial & Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,400,000	$ 6,200,000	$ 11,300,000