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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Separative work units inventory $ 47.2 $ 115.8
Uranium inventory 105.9 61.4
Materials and supplies 0.0 0.2
Inventories 153.1 177.4
Separative work units owed to customers and suppliers 15.0 15.2
Uranium owed to customers and suppliers 62.9 42.3
Inventories owed to customers and suppliers 77.9 57.5
Separative work units net of liability 32.2 100.6
Uranium inventory net of liability 43.0 19.1
Inventories, net $ 75.2 $ 119.9