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Variable Interest Entity (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
ASSETS    
Cash and cash equivalents $ 44.9 $ 32.9
Accounts receivable - net 108.9 75.8
Non-trade receivables 0.0 13.2
Inventories 542.2 539.0
Prepaid and other current assets 25.6 28.3
Total current assets 821.9 802.8
Property, plant and equipment - net 972.2 978.3
Other assets 69.3 87.9
Total assets 1,954.5 1,939.4
LIABILITIES    
Accounts payable, trade 201.7 187.3
Accrued compensation and benefits 40.6 49.8
Accrued and other current liabilities 36.6 42.0
Total current liabilities 447.4 463.7
Accrued benefits costs - less current portion 129.3 130.4
Other liabilities 95.7 92.6
Asset retirement obligations - less current portion 64.4 61.5
Total noncurrent liabilities 816.4 813.0
Variable Interest Entity, Primary Beneficiary    
ASSETS    
Cash and cash equivalents 43.3 17.4
Accounts receivable - net 1.1 1.1
Non-trade receivables 0.0 13.1
Inventories 90.6 109.8
Prepaid and other current assets 1.9 2.0
Total current assets 136.9 218.5
Property, plant and equipment - net 40.5 232.1
Other assets 10.8 23.1
Total assets 188.2 473.7
LIABILITIES    
Accounts payable, trade 35.7 39.1
Accrued compensation and benefits 5.4 8.5
Accrued and other current liabilities 3.2 7.2
Total current liabilities 59.3 104.4
Accrued benefits costs - less current portion 0.0 17.7
Other liabilities 62.7 66.7
Asset retirement obligations - less current portion 10.8 35.0
Total noncurrent liabilities 73.5 119.4
TOTAL LIABILITIES 132.8 223.8
Variable Interest Entity, Primary Beneficiary | Related Party    
ASSETS    
Due from affiliates 0.0 75.1
LIABILITIES    
Due to affiliates $ 15.0 $ 49.6