FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Level 3 rollforward
Balance at the beginning of the period	$ 19.9	$ 5.4	$ 2.4	$ 2.4
Purchases	0.2	0.0	22.1	6.1
Realized and unrealized gains (losses) included in earnings	(0.3)	0.0	1.5	0.0
Settlements	(7.8)	(1.7)	(14.0)	(4.8)
Balance at the end of the period	12.0	3.7	12.0	3.7
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) of level 3 derivatives held at the end of the reporting period	$ (0.2)	$ 0.0	$ 0.1	$ 0.0

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- Definition

Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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- Definition

Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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- Definition

Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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