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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Separative work units inventory $ 146.9 $ 221.5
Uranium inventory 38.7 97.5
Materials and supplies 0.2 0.2
Inventories 185.8 319.2
Separative work units owed to customers and suppliers 3.7 33.1
Uranium owed to customers and suppliers 18.5 73.7
Inventories owed to customers and suppliers 22.2 106.8
Separative work units net of liability 143.2 188.4
Uranium inventory net of liability 20.2 23.8
Inventories, net $ 163.6 $ 212.4