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Special Charges Special Charges (Tables)
 6 Months Ended
Jun. 30, 2017
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs [Table Text Block]
A summary of termination benefit activity and related liabilities follows (in millions):
 
 
Liability
December 31,
2016
 
Six Months Ended
June 30, 2017
 
Liability
June 30,
2017
 
 
 
 
Charges for Termination Benefits
 
Paid/ Settled
 
 
Workforce reductions:
 
 
 
 
 
 
 
 
 
Evolving business needs
 
$
0.1

 
$
1.5

 
$
(0.4
)
 
$
1.2

 
Piketon demonstration facility
 
5.4

 
0.1

 
(0.5
)
 
5.0

 
 
 
$
5.5

 
$
1.6

 
$
(0.9
)
 
$
6.2