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Acquisition of Jamalco - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Business Acquisition [Line Items]    
Bargain purchase gain $ 0.0 $ 273.4
General Alumina Holdings Limited    
Business Acquisition [Line Items]    
Cash and cash equivalents 19.4  
Restricted cash 8.3  
Accounts receivable - net 7.7  
Non-trade receivables 40.4  
Inventories 103.9  
Prepaid and other current assets 4.2  
Property, plant and equipment - net 217.2  
Other assets 26.1  
Accounts payable, trade (94.6)  
Accrued and other current liabilities (29.5)  
Other liabilities (36.5)  
Asset retirement obligation (23.9)  
Total identifiable net assets acquired and liabilities assumed 242.7  
Less: noncontrolling interest (3.2)  
Bargain purchase gain $ 245.9