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MARKETABLE SECURITIES - Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 40.2 | $ 40.9
Unrealized gains recorded in other income | 4.4 | 3.7
CYAPC and YAEC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 214.0 | 205.1
Marketable securities held in nuclear decommissioning trusts | $ 189.9 | $ 192.5

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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