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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory, Net [Abstract]  
Schedule of Inventories Components of inventories are as follows (in millions):
 March 31, 2021December 31, 2020
 Current
Assets
Current
Liabilities
(a)
Inventories, NetCurrent
Assets
Current
Liabilities
(a)
Inventories, Net
Separative work units$14.8 $0.1 $14.7 $17.0 $4.6 $12.4 
Uranium68.7 13.2 55.5 47.8 0.3 47.5 
Total$83.5 $13.3 $70.2 $64.8 $4.9 $59.9 
(a)Inventories owed to customers and suppliers, included in current liabilities, include SWU and uranium inventories owed to fabricators.