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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale equity securities | $ 23.3 |  | $ 23.3 |  | $ 40.2
Unrealized (loss) gain recorded in other income | (1.5) | $ (0.5) | (10.6) | $ 2.5 |
CYAPC and YAEC |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale equity securities | 170.1 |  | 170.1 |  | 214.0
Marketable securities held in nuclear decommissioning trust | $ 170.3 |  | $ 170.3 |  | $ 189.9

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