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Other Expense, Net
 12 Months Ended
Dec. 31, 2020
Other Income And Expenses [Abstract]  
Other Expense, Net

13. Other Expense, Net

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

 

 

 

Year Ended December 31,

 

 

 

2020

 

 

2019

 

 

2018

 

Interest income

 

$

0.6

 

 

$

0.6

 

 

$

0.3

 

Net periodic postretirement benefit cost relating to Salaried VEBA

 

 

(4.7

)

 

 

(6.5

)

 

 

(6.0

)

Realized gain on available for sale securities

 

 

2.0

 

 

 

4.4

 

 

 

5.4

 

Unrealized gain (loss) on equity securities

 

 

0.7

 

 

 

0.7

 

 

 

(1.0

)

Loss on extinguishment of debt

 

 

—

 

 

 

(20.3

)

 

 

—

 

All other, net

 

 

—

 

 

 

0.4

 

 

 

0.4

 

Other expense, net

 

$

(1.4

)

 

$

(20.7

)

 

$

(0.9

)