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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale equity securities |  |  |  | $ 20.0
Equity securities, realized gain |  | $ 1.1 |  |
Unrealized (loss) gain recorded in other income | $ 1.5 |  | $ 10.6 |
Losses recorded on securities intended to be sold |  | 15.3 | 5.8 |
Unrealized Gains/(Losses) on Marketable Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Losses recorded on securities intended to be sold |  | 1.2 | $ 0.0 |
CYAPC and YAEC |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale equity securities |  | 168.3 |  | 170.1
Marketable securities held in nuclear decommissioning trust |  | $ 162.2 |  | $ 163.2

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