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Transition Charges Transition Charges (Tables)
 9 Months Ended
Sep. 30, 2015
Restructuring and Related Activities [Abstract]  
Special Charges Summary [Table Text Block]
A summary of special charges and changes in the related balance sheet accounts in the nine months ended September 30, 2015 follows (in millions):
 
Liability Balance to Be Paid,
Dec. 31, 2014
 
Nine Months Ended September 30, 2015
 
Liability Balance to Be Paid,
Sep. 30, 2015
 
 
Special Charges
 

Paid
 
Workforce reductions, primarily severance payments
$
2.4

 
$
13.6

 
$
(6.7
)
 
$
9.3

Less: Amounts billed to DOE
 
 
(0.3
)
 
 
 
 
Special charges for workforce reductions

 
$
13.3