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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory, Net [Abstract]  
Schedule of Inventories Components of inventories are as follows (in millions):
 June 30, 2021December 31, 2020
 Current
Assets
Current
Liabilities
(a)
Inventories, NetCurrent
Assets
Current
Liabilities
(a)
Inventories, Net
Separative work units$14.7 $0.1 $14.6 $17.0 $4.6 $12.4 
Uranium71.8 0.2 71.6 47.8 0.3 47.5 
Total$86.5 $0.3 $86.2 $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.