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Acquisition of Jamalco - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 31, 2023
May 02, 2023
Dec. 31, 2022
Business Acquisition [Line Items]      
Deferred credit - preliminary bargain purchase gain $ 273.4   $ 0.0
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   246.2  
Other assets   26.0  
Accounts payable, trade   (94.8)  
Accrued and other current liabilities   (30.8)  
Other liabilities   (35.5)  
Asset retirement obligations   (23.9)  
Total identifiable assets acquired and liabilities assumed   271.1  
Less: noncontrolling interest   (2.3)  
Deferred credit - preliminary bargain purchase gain   $ 273.4