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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale equity securities | $ 26.4 |  | $ 26.4 |  | $ 40.2
Unrealized (loss) gain recorded in other income | (4.7) | $ 1.9 | (9.1) | $ 3.0 |
CYAPC and YAEC |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale equity securities | 182.4 |  | 182.4 |  | 214.0
Marketable securities held in nuclear decommissioning trust | $ 174.4 |  | $ 174.4 |  | $ 189.9

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