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FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Level 3 rollforward        
Balance at the beginning of the period $ 1.0 $ 0.9 $ 2.4 $ 2.4
Purchases 21.9 6.0 21.9 6.1
Realized and unrealized gains included in earnings 1.8 0.0 1.8 0.0
Settlements (4.8) (1.5) (6.2) (3.1)
Balance at the end of the period 19.9 5.4 19.9 5.4
Gains included in earnings attributable to the change in unrealized gains of level 3 derivatives held at the end of the reporting period $ 0.9 $ 0.0 $ 0.9 $ 0.0