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Basis of Presentation - Financial Statement Impact (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Prior period reclassification adjustment     $ 0.3      
Adoption of ASC 606 as of January 1, 2018     0.1      
Unbilled contract revenue $ 0.0   0.0   $ 0.1  
Accumulated deficit (343.3)   (343.3)   (284.4) $ (284.5)
Revenue 34.1 $ 50.3 109.2 $ 101.5    
Net income (loss) (7.8) (8.5) (58.9) (23.3)    
Cost of sales - separative work units and uranium 20.9 32.7 98.6 77.9    
Nonoperating components of periodic benefit expense (income), net (1.6) (0.3) (4.9) (1.1)    
Net cash used in operating activities     (77.7) (86.6)    
Net cash used in financing activities     (6.1) (40.0)    
Operating leases, future minimum payments due           $ 13.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
Unbilled contract revenue         0.1  
Accumulated deficit         $ 0.1  
Revenue 1.9   (0.1)      
Net income (loss) 1.9   (0.1)      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Revenue 32.2   109.3      
Net income (loss) $ (9.7)   $ (58.8)      
Scenario, Previously Reported [Member]            
Cost of sales - separative work units and uranium   32.4   76.8    
Net cash used in operating activities       (95.6)    
Net cash used in financing activities       (31.0)    
Restatement Adjustment [Member]            
Cost of sales - separative work units and uranium   0.3   1.1    
Nonoperating components of periodic benefit expense (income), net   $ 0.3   1.1    
Net cash used in operating activities       9.0    
Net cash used in financing activities       $ (9.0)