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Variable Interest Entity - Schedule of Consolidated VIE's Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
ASSETS      
Cash and cash equivalents $ 32.9 $ 88.8  
Accounts receivable - net 75.8 53.7  
Non-trade receivables 13.2 36.2  
Inventories 539.0 477.0  
Prepaid and other current assets 28.3 27.5  
Total current assets 802.8 767.1  
Property, plant and equipment - net 978.3 1,004.2  
Other assets 87.9 75.2  
TOTAL 1,939.4 1,846.5 $ 1,472.0
LIABILITIES      
Accounts payable, trade 187.3 249.5  
Accrued compensation and benefits 49.8 38.1  
Accrued and other current liabilities 42.0 50.9  
Total current liabilities 463.7 763.0  
Accrued benefits costs - less current portion 130.4 120.3  
Other liabilities 92.6 66.3  
Asset retirement obligations - less current portion 61.5 49.5  
Total noncurrent liabilities 813.0 739.4  
Variable Interest Entity, Primary Beneficiary      
ASSETS      
Cash and cash equivalents 17.4 7.4  
Accounts receivable - net 1.1 0.0  
Non-trade receivables 13.1 38.3  
Inventories 109.8 96.6  
Prepaid and other current assets 2.0 8.7  
Total current assets 218.5 227.7  
Property, plant and equipment - net 232.1 248.7  
Other assets 23.1 27.1  
TOTAL 473.7 503.5  
LIABILITIES      
Accounts payable, trade 39.1 73.1  
Accrued compensation and benefits 8.5 2.3  
Accrued and other current liabilities 7.2 7.1  
Total current liabilities 104.4 137.9  
Accrued benefits costs - less current portion 17.7 0.8  
Other liabilities 66.7 36.1  
Asset retirement obligations - less current portion 35.0 26.0  
Total noncurrent liabilities 119.4 62.9  
TOTAL 223.8 200.8  
Variable Interest Entity, Primary Beneficiary | Related Party      
ASSETS      
Due from affiliates 75.1 76.7  
LIABILITIES      
Due to affiliates $ 49.6 $ 55.4