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PROPERTY, PLANT, AND EQUIPMENT - PUBLIC SERVICE BUILDING (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Property, plant, and equipment |  |  |
Insurance proceeds received | $ 0.0 | $ 22.2 |
WE | Public Service Building |  |  |
Property, plant, and equipment |  |  |
Costs incurred for repairs and restorations | 93.5 |  |
Insurance proceeds received |  |  | $ 20.0
Receivable for future insurance recoveries | $ 61.0 |  |
Costs included in other operation and maintenance |  |  | $ 12.5

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