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Inventories (Tables)
3 Months Ended
Mar. 31, 2024
Inventory, Net [Abstract]  
Schedule of Inventories Components of inventories are as follows (in millions):
 March 31, 2024December 31, 2023
 Current
Assets
Current
Liabilities
(a)
Inventories, NetCurrent
Assets
Current
Liabilities
(a)
Inventories, Net
Separative work units$20.7 $— $20.7 $21.9 $— $21.9 
Uranium258.5 21.6 236.9 284.5 84.3 200.2 
Total$279.2 $21.6 $257.6 $306.4 $84.3 $222.1 
(a)This includes inventories owed to suppliers for advances of uranium.