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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Separative work units inventory $ 69.1 $ 115.8
Uranium inventory 34.7 61.4
Materials and supplies 0.2 0.2
Inventories 104.0 177.4
Separative work units owed to customers and suppliers 10.8 15.2
Uranium owed to customers and suppliers 16.0 42.3
Inventories owed to customers and suppliers 26.8 57.5
Separative work units net of liability 58.3 100.6
Uranium inventory net of liability 18.7 19.1
Inventories, net $ 77.2 $ 119.9