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Variable Interest Entity - Schedule of consolidated VIE's assets and liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
ASSETS    
Cash and cash equivalents $ 151.4 $ 32.9
Accounts receivable - net 116.9 75.8
Non-trade receivables 0.0 13.2
Inventories 556.7 539.0
Prepaid and other current assets 25.1 28.3
Total current assets 1,027.1 802.8
Property, plant and equipment - net 972.2 978.3
Other assets 71.1 87.9
Total assets 2,134.2 1,939.4
LIABILITIES    
Accounts payable, trade 207.4 187.3
Accrued compensation and benefits 52.4 49.8
Accrued and other current liabilities 73.6 42.0
Total current liabilities 599.1 463.7
Accrued benefits costs - less current portion 121.8 130.4
Other liabilities 102.7 92.6
Asset retirement obligations - less current portion 63.9 61.5
Total noncurrent liabilities 837.7 813.0
Variable Interest Entity, Primary Beneficiary    
ASSETS    
Cash and cash equivalents 17.8 17.4
Accounts receivable - net 0.5 1.1
Non-trade receivables 0.0 13.1
Inventories 100.9 109.8
Prepaid and other current assets 8.7 2.0
Total current assets 127.9 218.5
Property, plant and equipment - net 59.9 232.1
Other assets 11.3 23.1
Total assets 199.1 473.7
LIABILITIES    
Accounts payable, trade 41.9 39.1
Accrued compensation and benefits 7.3 8.5
Accrued and other current liabilities 2.5 7.2
Total current liabilities 65.3 104.4
Accrued benefits costs - less current portion 0.0 17.7
Other liabilities 62.4 66.7
Asset retirement obligations - less current portion 11.1 35.0
Total noncurrent liabilities 73.5 119.4
TOTAL 138.8 223.8
Variable Interest Entity, Primary Beneficiary | Related Party    
ASSETS    
Due from affiliates 0.0 75.1
LIABILITIES    
Due to affiliates $ 13.6 $ 49.6