Environmental and legal matters Environmental and legal matters (Details)	Jul. 08, 2019	Mar. 03, 2017	Mar. 20, 2014
Loss Contingencies
Number of facilities served search and seizure warrants		3
Companies
Loss Contingencies
Number of Defendants			18
Individuals
Loss Contingencies
Number of Defendants			100
Subsidiaries
Loss Contingencies
Number of Defendants			2
Number of defendants, current employees
Loss Contingencies
Number of Defendants			1
Number of defendants, former employees
Loss Contingencies
Number of Defendants			2
Subsequent Event | Number of defendants found liable, current employee
Loss Contingencies
Number of Defendants	1
Subsequent Event | Number of defendants found liable, former employee
Loss Contingencies
Number of Defendants	2