SEGMENT INFORMATION (Schedule of Segment Reporting) (Details) - USD ($) $ in Millions |
12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Segment Reporting Information [Line Items] | |||||||||||||
| Sales | $ 29,332.3 | $ 33,115.3 | $ 38,324.8 | ||||||||||
| Cost of products and other | 26,627.0 | 30,266.7 | 32,671.3 | ||||||||||
| Operating expenses (excluding depreciation and amortization expense as reflected below) | 2,646.0 | 2,606.2 | 2,694.9 | ||||||||||
| Depreciation and amortization expense | 644.7 | 627.8 | 571.5 | ||||||||||
| Other segment (income) expenses, net | [1] | (531.1) | 313.6 | (564.4) | |||||||||
| Income (loss) from operations | (54.3) | (699.0) | 2,951.5 | ||||||||||
| Interest (income) expense, net | 181.6 | 72.0 | 63.8 | ||||||||||
| Capital expenditures | 628.9 | 1,008.3 | 1,173.6 | ||||||||||
| Total assets | 13,019.9 | 12,703.2 | |||||||||||
| Loss (gain) on formation of SBR equity method investment | 0.0 | (8.7) | 925.1 | ||||||||||
| Equity method investment in SBR | 826.3 | 866.8 | |||||||||||
| Martinez Fire Rebuild | |||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||
| Capital expenditures | 532.9 | ||||||||||||
| Renewable Diesel Facility | |||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||
| Capital expenditures | 5.6 | 312.7 | |||||||||||
| Eliminations | |||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||
| Sales | (348.9) | (349.4) | (347.8) | ||||||||||
| Cost of products and other | (331.5) | (332.0) | (329.5) | ||||||||||
| Operating expenses (excluding depreciation and amortization expense as reflected below) | (17.5) | (17.4) | (18.3) | ||||||||||
| Depreciation and amortization expense | 0.0 | 0.0 | 0.0 | ||||||||||
| Other segment (income) expenses, net | [1] | 0.0 | 0.0 | 0.0 | |||||||||
| Income (loss) from operations | 0.0 | 0.0 | 0.0 | ||||||||||
| Interest (income) expense, net | 0.0 | 0.0 | 0.0 | ||||||||||
| Capital expenditures | 0.0 | 0.0 | 0.0 | ||||||||||
| Total assets | (38.9) | (39.6) | |||||||||||
| Refining | Operating Segments | |||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||
| Sales | 29,297.7 | 33,077.9 | 38,288.5 | ||||||||||
| Cost of products and other | 26,950.2 | 30,590.4 | 33,000.8 | ||||||||||
| Operating expenses (excluding depreciation and amortization expense as reflected below) | 2,547.0 | 2,487.8 | 2,581.3 | ||||||||||
| Depreciation and amortization expense | 594.2 | 578.4 | 523.9 | ||||||||||
| Other segment (income) expenses, net | [1] | (831.4) | 0.9 | (1.1) | |||||||||
| Income (loss) from operations | 37.6 | (579.5) | 2,183.6 | ||||||||||
| Interest (income) expense, net | (27.7) | (14.1) | (4.8) | ||||||||||
| Capital expenditures | [2] | 598.1 | 994.8 | 1,152.9 | |||||||||
| Total assets | 11,469.1 | 10,945.5 | |||||||||||
| Logistics | Operating Segments | |||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||
| Sales | 383.5 | 386.8 | 384.1 | ||||||||||
| Cost of products and other | 8.3 | 8.3 | 0.0 | ||||||||||
| Operating expenses (excluding depreciation and amortization expense as reflected below) | 116.5 | 135.8 | 131.9 | ||||||||||
| Depreciation and amortization expense | 36.1 | 36.2 | 36.1 | ||||||||||
| Other segment (income) expenses, net | [1] | (86.9) | 7.3 | 10.0 | |||||||||
| Income (loss) from operations | 309.6 | 199.1 | 206.1 | ||||||||||
| Interest (income) expense, net | (1.6) | (1.9) | 2.3 | ||||||||||
| Capital expenditures | 17.0 | 6.5 | 11.9 | ||||||||||
| Total assets | 683.4 | 781.9 | |||||||||||
| Corporate | Segment Reporting, Reconciling Item, Corporate Nonsegment | |||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||
| Sales | 0.0 | 0.0 | 0.0 | ||||||||||
| Cost of products and other | 0.0 | 0.0 | 0.0 | ||||||||||
| Operating expenses (excluding depreciation and amortization expense as reflected below) | 0.0 | 0.0 | 0.0 | ||||||||||
| Depreciation and amortization expense | 14.4 | 13.2 | 11.5 | ||||||||||
| Other segment (income) expenses, net | [1] | 387.2 | 305.4 | [3] | (573.3) | ||||||||
| Income (loss) from operations | (401.5) | [3] | (318.6) | [3] | 561.8 | ||||||||
| Interest (income) expense, net | 210.9 | 88.0 | 66.3 | ||||||||||
| Capital expenditures | 13.8 | 7.0 | $ 8.8 | ||||||||||
| Total assets | [4] | $ 906.3 | $ 1,015.4 | ||||||||||
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