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FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Level 3 rollforward        
Balance at the beginning of the period $ 3.0 $ 2.6 $ 7.8 $ 7.2
Purchases 22.5 25.8 23.7 26.8
Net realized and unrealized gains (losses) included in earnings 0.3 (0.2) 0.0 (1.0)
Settlements (6.8) (7.4) (12.5) (12.2)
Balance at the end of the period 19.0 20.8 19.0 20.8
Net unrealized losses included in earnings attributable to level 3 derivatives held at the end of the reporting period $ 0.0 $ (0.2) $ 0.0 $ (0.2)