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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments |  |  | $ 751.0 | $ 1,369.0
Nuclear decommissioning trusts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 474.0 | $ 948.0 | 751.0 | 1,369.0
Gross realized gains on securities | 37.0 | 81.0 | 42.0 | 137.0
Gross realized losses on securities | (10.0) | (58.0) | (18.0) | (65.0)
Customer credit trust |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 135.0 | 0.0 | 304.0 | 0.0
Gross realized gains on securities | 6.0 | 1.0 | 8.0 | 1.0
Gross realized losses on securities | (5.0) | $ (8.0) | $ (10.0) | $ (8.0)
Impairment write down | $ 4.3 |  |  |

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