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Special Charges Special Charges (Tables)
 6 Months Ended
Jun. 30, 2016
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs [Table Text Block]
A summary of termination benefit activity and changes in the related balance sheet account in the six months ended June 30, 2016, follows (in millions):
 
 
Liability
Dec. 31,
2015
 
Six Months Ended
June 30, 2016
 
Liability
June 30,
2016
 
 
 
 
Charges for Termination Benefits
 
Paid
 
 
Workforce reductions:
 
 
 
 
 
 
 
 
 
Enrichment cessation and evolving business needs
 
$
0.3

 
$
—

 
$
(0.1
)
 
$
0.2

 
American Centrifuge
 
8.4

 
0.1

 
(2.2
)
 
6.3

 
 
 
$
8.7

 
$
0.1

 
$
(2.3
)
 
$
6.5