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Special Charges Special Charges (Tables)
 12 Months Ended
Dec. 31, 2017
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,
2015
 
2016
 
Liability
Dec. 31,
2016
 
2017
 
Liability
Dec. 31,
2017

 
Charges for Termination Benefits
 

Paid
 
 
Charges for Termination Benefits
 
Paid/
Settled
 
Workforce reductions:
 
 
 
 
 
 
 
 
 
 
 
 
 
Evolving business needs
$
0.3

 
$
0.3

 
$
(0.5
)
 
$
0.1

 
$
2.4

 
$
(1.7
)
 
$
0.8

Piketon demonstration facility
8.4

 
0.1

 
(3.1
)
 
5.4

 
1.1

 
(0.8
)
 
5.7

 
$
8.7

 
$
0.4

 
$
(3.6
)
 
$
5.5

 
$
3.5

 
$
(2.5
)
 
$
6.5