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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Inventory [Line Items]    
Separative work units inventory $ 285.7 $ 330.6
Uranium inventory 98.9 131.4
Materials and supplies 0.2 0.2
Inventories 384.8 462.2
Separative work units owed to customers and suppliers 99.1 76.6
Uranium owed to customers and suppliers 100.5 82.3
Inventories owed to customers and suppliers 199.6 158.9
Separative work units net of liability 186.6 254.0
Uranium inventory net of liability (1.6) 49.1
Inventories, net $ 185.2 $ 303.3