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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Separative work units inventory $ 103.8 $ 115.8
Uranium inventory 39.6 61.4
Materials and supplies 0.2 0.2
Inventories 143.6 177.4
Separative work units owed to customers and suppliers 2.3 15.2
Uranium owed to customers and suppliers 20.5 42.3
Inventories owed to customers and suppliers 22.8 57.5
Separative work units net of liability 101.5 100.6
Uranium inventory net of liability 19.1 19.1
Inventories, net $ 120.8 $ 119.9