Contingencies (Narrative) (Details) $ in Millions	Jun. 30, 2021 USD ($) claim	Dec. 31, 2020 claim	Dec. 31, 2019 claim	Dec. 31, 2018 claim	Dec. 31, 2017 claim	Dec. 31, 2016 claim	Dec. 31, 2015 claim
Loss Contingencies [Line Items]
Number of pending claims	3,617
Asbestos Issue
Loss Contingencies [Line Items]
Total resolved claims, by means of settlement or dismissal	37,957
Total cost of resolution | $	$ 10.4
Confirmed insurance coverage | $	$ 140.0
Resolution costs paid by insurance carrier	100.00%
Number of pending claims	3,617	3,615	3,708	3,684	3,730	3,745	3,791
Asbestos Issue | Brandon Drying Fabrics, Inc.
Loss Contingencies [Line Items]
Total resolved claims, by means of settlement or dismissal	7,709
Resolution costs paid by insurance carrier	100.00%
Number of pending claims	12