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Contingencies (Narrative) (Details) $ in Millions | Mar. 31, 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 | 37,954 |  |  |  |  |  |
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 |  |  |  |  |  |

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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
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