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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Separative work units inventory $ 159.8 $ 221.5
Uranium inventory 41.2 97.5
Materials and supplies 0.2 0.2
Inventories 201.2 319.2
Separative work units owed to customers and suppliers 18.5 33.1
Uranium owed to customers and suppliers 21.0 73.7
Inventories owed to customers and suppliers 39.5 106.8
Separative work units net of liability 141.3 188.4
Uranium inventory net of liability 20.2 23.8
Inventories, net $ 161.7 $ 212.4