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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Separative work units inventory $ 115.8 $ 221.5
Uranium inventory 61.4 97.5
Materials and supplies 0.2 0.2
Inventories 177.4 319.2
Separative work units owed to customers and suppliers 15.2 33.1
Uranium owed to customers and suppliers 42.3 73.7
Inventories owed to customers and suppliers 57.5 106.8
Separative work units net of liability 100.6 188.4
Uranium inventory net of liability 19.1 23.8
Inventories, net $ 119.9 $ 212.4