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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale equity securities | $ 3.1 |  | $ 3.1 |  | $ 20.0
Unrealized (loss) gain recorded in other income | 4.7 | $ 4.7 | 3.9 | $ 9.1 |
Losses recorded on securities intended to be sold |  |  | 7.2 | 3.2 |
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 | 161.6 |  | 161.6 |  | 170.1
Marketable securities held in nuclear decommissioning trust | $ 165.8 |  | $ 165.8 |  | $ 163.2

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