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Restructuring Expenses and Repositioning Expenses (Tables)
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Schedule of restructuring expenses and asset impairments
The following table presents restructuring expenses by reportable segment for the three and six months ended June 30, 2018.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In millions)
2018
 
2017
 
2018
 
2017
Catalysts Technologies
$
1.0

 
$
—

 
$
1.5

 
$
0.4

Materials Technologies
—

 
0.1

 
0.4

 
0.3

Corporate
—

 
1.9

 
0.1

 
4.1

Total restructuring expenses
$
1.0

 
$
2.0

 
$
2.0

 
$
4.8
Schedule of restructuring liability
The following table presents components of the change in the restructuring liability from December 31, 2017, to June 30, 2018.
 
(In millions)
Balance, December 31, 2017
$
6.7

Accruals for severance and other costs
2.0

Payments
(5.1
)
Currency translation adjustments and other
0.1

Balance, June 30, 2018
$
3.7