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Other Expense, Net
 9 Months Ended
Sep. 30, 2020
Other Income And Expenses [Abstract]  
Other Expense, Net

10. Other Expense, Net

Other expense, net, consisted of the following for the periods presented (in millions of dollars):

 

 

 

Quarter Ended

September 30,

 

 

Nine Months Ended

September 30,

 

 

 

2020

 

 

2019

 

 

2020

 

 

2019

 

Interest income

 

$

0.2

 

 

$

0.2

 

 

$

0.5

 

 

$

0.5

 

Net periodic postretirement benefit cost relating to Salaried VEBA

 

 

(1.1

)

 

 

(1.6

)

 

 

(3.5

)

 

 

(4.9

)

Realized gain on available for sale securities

 

 

—

 

 

 

0.9

 

 

 

2.1

 

 

 

3.0

 

Unrealized gain on equity securities

 

 

0.3

 

 

 

0.1

 

 

 

0.4

 

 

 

0.6

 

All other income (expense), net

 

 

0.1

 

 

 

(0.4

)

 

 

(0.3

)

 

 

0.4

 

Other expense, net

 

$

(0.5

)

 

$

(0.8

)

 

$

(0.8

)

 

$

(0.4

)