MARKETABLE SECURITIES - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	$ 3,700,000		$ 3,300,000
Unrealized (loss) gain recorded in other income	400,000	$ 800,000
Credit loss	0	0
Allowance for credit loss	0
Allowance for uncollectible accounts for late fees and other receivable amounts	570,100,000	$ 535,100,000	554,500,000	$ 486,300,000
CYAPC and YAEC
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	172,300,000		173,600,000
Marketable securities held in nuclear decommissioning trust	$ 162,000,000		$ 164,300,000