FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Level 3 rollforward
Balance at the beginning of the period	$ 20.8	$ 16.8	$ 7.2	$ 7.8
Purchases	0.7	0.4	27.5	19.9
Net realized and unrealized gains (losses) included in earnings	0.5	0.1	(0.5)	(0.4)
Settlements	(10.0)	(6.0)	(22.2)	(16.0)
Balance at the end of the period	12.0	11.3	12.0	11.3
Net unrealized gains included in earnings attributable to level 3 derivatives held at the end of the reporting period	$ 0.2	$ 0.1	$ 0.1	$ 0.1