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RELATED PARTY TRANSACTIONS (Summary of Transactions with SBR) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Revenues	$ 11,676.3	$ 7,465.6	$ 19,576.1	$ 14,522.7
Accounts receivable	1,792.2		1,792.2		$ 1,120.1
Accrued expenses	3,209.3		3,209.3		2,614.2
St. Bernard Renewables LLC
Related Party Transaction [Line Items]
Accounts receivable	44.6		44.6		44.1
Accrued expenses	84.8		84.8		$ 39.4
St. Bernard Renewables LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Related Party Transaction [Line Items]
Revenues	32.8	16.9	54.4	30.3
Purchases	(253.0)	(121.3)	(410.5)	(181.6)
Limited financial performance guarantee of a term loan	$ 100.0		$ 100.0
Guarantor obligations, maximum exposure, percentage	50.00%		50.00%
Equity method investment, ownership percentage	50.00%		50.00%
St. Bernard Renewables LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees \| General and Administrative Expense \| Operating agreement
Related Party Transaction [Line Items]
Total expenses under affiliate agreements	$ 31.8	34.4	$ 101.9	74.4
St. Bernard Renewables LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees \| General and Administrative Expense \| Omnibus agreement
Related Party Transaction [Line Items]
Total expenses under affiliate agreements	0.9	0.9	1.9	1.9
St. Bernard Renewables LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees \| General and Administrative Expense \| Common asset use and servitude agreement
Related Party Transaction [Line Items]
Total expenses under affiliate agreements	1.7	1.8	3.7	4.0
St. Bernard Renewables LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees \| Cost of Sales \| Lease Agreements
Related Party Transaction [Line Items]
Total expenses under affiliate agreements	$ 0.0	$ (2.8)	$ 0.0	$ (8.1)