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Legal Proceedings (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Jul. 31, 2019
Pending Litigation | Jo Ann Howard Pc Et Al V Cassity Et Al |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Compensatory damages |  |  |  | $ 72.0
Loss contingency, damages awarded, interest, value |  |  |  | 15.0
Punitive damages |  |  |  | $ 15.0
Increase (decrease) in damages awarded |  | $ 2.6 |  |
Loss contingency, damages awarded, value |  | $ 99.5 |  |
Loss contingency, damages sought, value | $ 7.0 |  |  |
SEC Schedule, 12-09, Reserve, Legal | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss not accrued |  |  | $ 100.0 |

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