v3.26.1
Fair Value Measurements - Schedule of Recurring Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivative assets:    
Derivative assets: $ 0.0 $ 6.7
Total derivative assets 0.0 29.8
Pension plan investments 26.3 26.2
Other 4.6 3.1
Total recurring assets at fair value 30.9 59.1
Derivative liabilities:    
Derivative liabilities (64.9) 0.0
Total derivative liabilities (65.3) 0.0
Liability awards (74.0) (43.1)
Total recurring liabilities at fair value (139.3) (43.1)
Crack spread swaps    
Derivative assets:    
Derivative assets: 0.0 6.7
Derivative liabilities:    
Derivative liabilities (64.9) 0.0
Inventory financing obligation    
Derivative assets:    
Inventory financing obligation 0.0 23.1
Derivative liabilities:    
Inventory financing obligation (0.4) 0.0
Level 1    
Derivative assets:    
Total derivative assets 0.0 0.0
Pension plan investments 3.3 3.3
Other 1.0 0.8
Total recurring assets at fair value 4.3 4.1
Derivative liabilities:    
Total derivative liabilities 0.0 0.0
Liability awards (74.0) (43.1)
Total recurring liabilities at fair value (74.0) (43.1)
Level 1 | Crack spread swaps    
Derivative assets:    
Derivative assets: 0.0 0.0
Derivative liabilities:    
Derivative liabilities 0.0 0.0
Level 1 | Inventory financing obligation    
Derivative assets:    
Inventory financing obligation 0.0 0.0
Derivative liabilities:    
Inventory financing obligation 0.0 0.0
Level 2    
Derivative assets:    
Total derivative assets 0.0 0.0
Pension plan investments 23.0 22.9
Other 3.6 2.3
Total recurring assets at fair value 26.6 25.2
Derivative liabilities:    
Total derivative liabilities 0.0 0.0
Liability awards 0.0 0.0
Total recurring liabilities at fair value 0.0 0.0
Level 2 | Crack spread swaps    
Derivative assets:    
Derivative assets: 0.0 0.0
Derivative liabilities:    
Derivative liabilities 0.0 0.0
Level 2 | Inventory financing obligation    
Derivative assets:    
Inventory financing obligation 0.0 0.0
Derivative liabilities:    
Inventory financing obligation 0.0 0.0
Level 3    
Derivative assets:    
Total derivative assets 0.0 29.8
Pension plan investments 0.0 0.0
Other 0.0 0.0
Total recurring assets at fair value 0.0 29.8
Derivative liabilities:    
Total derivative liabilities (65.3) 0.0
Liability awards 0.0 0.0
Total recurring liabilities at fair value (65.3) 0.0
Level 3 | Crack spread swaps    
Derivative assets:    
Derivative assets: 0.0 6.7
Derivative liabilities:    
Derivative liabilities (64.9) 0.0
Level 3 | Inventory financing obligation    
Derivative assets:    
Inventory financing obligation 0.0 23.1
Derivative liabilities:    
Inventory financing obligation $ (0.4) $ 0.0