Contingencies (Narrative) (Details) - Asbestos Issue [Member] $ in Millions	Sep. 30, 2020 USD ($) claims	Dec. 31, 2019 claims	Dec. 31, 2018 claims	Dec. 31, 2017 claims	Dec. 31, 2016 claims	Dec. 31, 2015 claims	Dec. 31, 2014 claims
Loss Contingencies [Line Items]
Number of claims	3,616	3,708	3,684	3,730	3,745	3,791	3,821
Total resolved claims, by means of settlement or dismissal	37,930
Total cost of resolution | $	$ 10.4
Confirmed insurance coverage | $	$ 140.0
Resolution costs paid by insurance carrier	100.00%
Brandon Drying Fabrics, Inc. [Member]
Loss Contingencies [Line Items]
Total resolved claims, by means of settlement or dismissal	7,710
Resolution costs paid by insurance carrier	100.00%