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Contingencies and Environmental Remediation (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($) item
Litigation contingencies |
Possible loss | $ | $ 5.2
Chemetco Superfund Site | CWV |
Litigation contingencies |
Number of companies joining group for environmental liability notice | 43
Number of settlements with individuals | 675
Number of settlements with former group members | 20

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