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Special Charges Special Charges (Tables)
 12 Months Ended
Dec. 31, 2016
Restructuring and Related Activities [Abstract]  
Special Charges Summary [Table Text Block]
A summary of termination benefit activity and related liabilities follows (in millions):
 
Liability
Dec. 31,
2014
 
2015
 
Liability
Dec. 31,
2015
 
2016
 
Liability
Dec. 31,
2016
 

 
Special Charges
 

Paid
 
 
Special Charges
 

Paid
 
 
Workforce reductions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Enrichment cessation and evolving business needs
$
2.4

 
$
4.5

(a)
$
(6.6
)
(a)
$
0.3

 
$
0.3

 
$
(0.5
)
 
$
0.1

 
Piketon demonstration facility
—

 
8.7

 
(0.3
)
 
8.4

 
0.1

 
(3.1
)
 
5.4

(b)
 
$
2.4

 
$
13.2

 
$
(6.9
)
 
$
8.7

 
$
0.4

 
$
(3.6
)
 
$
5.5

 

(a) Net of $0.4 million billed to and paid by DOE.
(b) Includes $2.1 million included in long-term liabilities.