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Special Charges Special Charges (Tables)
 9 Months Ended
Sep. 30, 2018
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
A summary of termination benefit activity and related liabilities follows (in millions):
 
 
Liability
December 31,
2017
 
Nine Months Ended
September 30, 2018
 
Liability
September 30,
2018
 
 
 
Charges for Termination Benefits
 
Paid/Settled
 
Workforce reductions:
 
 
 
 
 
 
 
 
Evolving business needs
 
$
0.8

 
$
1.3

 
$
(1.5
)
 
$
0.6

Piketon demonstration facility
 
5.7

 
0.1

 
(2.6
)
 
3.2

Total
 
$
6.5

 
$
1.4

 
$
(4.1
)
 
$
3.8