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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 3.3 | $ 20.0 |
Equity securities, FV-NI, realized gain | 1.1 |  |
Unrealized losses recorded in other income |  | 9.7 |
Unrealized gains recorded in other income |  |  | $ 4.4
Unrealized Gains/(Losses) on Marketable Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Losses recorded on securities intended to be sold | 1.2 |  |
CYAPC and YAEC |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 173.6 | 170.1 |
Marketable securities held in nuclear decommissioning trusts | $ 164.3 | $ 163.2 |

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