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Special Charges (Narrative)(Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Actuarial (gain) loss from remeasurement, net                 $ (1.4) $ 29.6  
Termination benefit costs     $ 0.1     $ 8.7     0.4    
Other restructuring costs                 1.0    
DOE Share of Paducah Termination Benefit Costs                   0.4  
Payments for Restructuring                 (3.6) (6.9)  
Restructuring Reserve $ 5.5       $ 8.7       5.5 8.7 $ 2.4
Restructuring Reserve, Noncurrent 2.1               2.1    
Restructuring Charges 0.2 $ 0.6 $ 0.6 $ 0.0 (0.1) $ 9.8 $ 2.9 $ 0.6 1.4 13.2  
Contract Termination [Member]                      
Termination benefit costs                 0.1 8.7  
Payments for Restructuring                 (3.1) (0.3)  
Restructuring Reserve 5.4       8.4       5.4 8.4  
Other Restructuring [Member]                      
Termination benefit costs                 0.3 4.5  
Payments for Restructuring                 (0.5) (6.6)  
Restructuring Reserve $ 0.1       $ 0.3       $ 0.1 $ 0.3 $ 2.4