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Acquisition of Jamalco - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
May 02, 2023
Jun. 30, 2023
Dec. 31, 2022
Less: identifiable assets acquired and liabilities assumed      
Deferred credit - preliminary bargain purchase gain   $ (103.3) $ 0.0
General Alumina Holdings Limited      
Consideration transferred      
Cash paid $ 8.3    
Total consideration transferred 8.3    
Less: identifiable assets acquired and liabilities assumed      
Cash and cash equivalents 19.4    
Restricted cash 8.3    
Inventories 93.4    
Accounts receivable - net 8.0    
Prepaid and other current assets 7.7    
Property, plant and equipment - net 102.2    
Deferred tax assets 108.1    
Other long-term assets 25.5    
Accounts payable, trade (92.9)    
Accrued and other current liabilities (33.9)    
Asset retirement obligations (101.4)    
Total identifiable net assets acquired 144.4    
Less: noncontrolling interest (32.8)    
Deferred credit - preliminary bargain purchase gain (103.3)    
Fair value allocated to net assets acquired, net of bargain purchase gain $ 8.3