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FAIR VALUE MEASUREMENTS - Assets and Liabilities at Fair Value, Recurring (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value Measurements    
Assets at fair value $ 4.8 $ 0.3
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts and Other Receivables, Net, Current Accounts and Other Receivables, Net, Current
Liabilities at fair value $ (9.1) $ (25.7)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable, Current Accounts Payable, Current
Total net derivative position $ (4.3) $ (27.0)
Property Plant And Equipment At Fair Value | Boehlen Location    
Fair Value Measurements    
Assets at fair value, nonrecurring 3.2 3.2
Commodity Contract    
Fair Value Measurements    
Liabilities at fair value (3.6) (7.2)
Total net derivative position (3.6) (8.1)
Commodity Contract | Cash Flow Hedges    
Fair Value Measurements    
Liabilities at fair value (4.8) (13.7)
Total net derivative position (4.8) (14.4)
Not Designated as Hedging Instruments | Foreign exchange forward contracts    
Fair Value Measurements    
Assets at fair value $ 4.8 0.3
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts and Other Receivables, Net, Current  
Liabilities at fair value $ (0.7) $ (4.8)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Accounts Payable, Current
Total net derivative position $ 4.1 $ (4.5)
Not Designated as Hedging Instruments | Commodity Contract    
Fair Value Measurements    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable, Current Accounts Payable, Current
Not Designated as Hedging Instruments | Commodity Contract | Cash Flow Hedges    
Fair Value Measurements    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable, Current Accounts Payable, Current
Recurring    
Fair Value Measurements    
Total net derivative position $ (4.3) $ (27.0)
Recurring | Level 2    
Fair Value Measurements    
Total net derivative position (4.3) (27.0)
Recurring | Not Designated as Hedging Instruments | Foreign exchange forward contracts    
Fair Value Measurements    
Assets at fair value 4.1  
Liabilities at fair value   (4.5)
Recurring | Not Designated as Hedging Instruments | Commodity Contract    
Fair Value Measurements    
Liabilities at fair value (3.6) (8.1)
Recurring | Not Designated as Hedging Instruments | Commodity Contract | Cash Flow Hedges    
Fair Value Measurements    
Liabilities at fair value (4.8) (14.4)
Recurring | Not Designated as Hedging Instruments | Level 2 | Foreign exchange forward contracts    
Fair Value Measurements    
Assets at fair value 4.1  
Liabilities at fair value   (4.5)
Recurring | Not Designated as Hedging Instruments | Level 2 | Commodity Contract    
Fair Value Measurements    
Liabilities at fair value (3.6) (8.1)
Recurring | Not Designated as Hedging Instruments | Level 2 | Commodity Contract | Cash Flow Hedges    
Fair Value Measurements    
Liabilities at fair value $ (4.8) (14.4)
Nonrecurring    
Fair Value Measurements    
Assets at fair value, nonrecurring   0.0
Liabilities at fair value, nonrecurring   $ 0.0