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Special Charges Special Charges (Tables)
 3 Months Ended
Mar. 31, 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
 
Three Months Ended
March 31, 2018
 
Liability
March 31, 2018
 
 
 
Charges for Termination Benefits
 
Paid/Settled
 
Workforce reductions:
 
 
 
 
 
 
 
 
Evolving business needs
 
$
0.8

 
$
0.7

 
$
(0.4
)
 
$
1.1

Piketon demonstration facility
 
5.7

 
—

 
(1.9
)
 
3.8

 
 
$
6.5

 
$
0.7

 
$
(2.3
)
 
$
4.9