Annual report pursuant to Section 13 and 15(d)

Industry Segments - Narrative (Details)

v3.20.4
Industry Segments - Narrative (Details)
12 Months Ended
Dec. 31, 2020
segment
reporting_unit
Segment Reporting Information [Line Items]  
Number of operating segments | segment 2
Number of reportable segments | segment 2
Metals Segment  
Segment Reporting Information [Line Items]  
Number of reporting units | reporting_unit 3
Specialty Chemicals Segment  
Segment Reporting Information [Line Items]  
Number of reporting units | reporting_unit 1