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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory, Net [Abstract]    
Separative work units inventory $ 14.7 $ 17.0
Uranium inventory 71.8 47.8
Inventories 86.5 64.8
Separative work units owed to customers and suppliers 0.1 4.6
Uranium owed to customers and suppliers 0.2 0.3
Inventories owed to customers and suppliers 0.3 4.9
Separative work units net of liability 14.6 12.4
Uranium inventory net of liability 71.6 47.5
Inventories, net $ 86.2 $ 59.9