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Other Expense, Net (Tables)
 12 Months Ended
Dec. 31, 2021
Other Income And Expenses [Abstract]  
Other Expense, Net

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

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

 

2019

 

Interest income

 

$

0.2

 

 

$

0.6

 

 

$

0.6

 

Net periodic postretirement benefit cost

 

 

(4.1

)

 

 

(4.7

)

 

 

(6.5

)

Realized gain on available for sale securities

 

 

—

 

 

 

2.0

 

 

 

4.4

 

Unrealized (loss) gain on equity securities

 

 

(0.2

)

 

 

0.7

 

 

 

0.7

 

(Loss) gain on extinguishment of debt – Note 9

 

 

(35.9

)

 

 

—

 

 

 

(20.3

)

All other, net

 

 

1.1

 

 

 

—

 

 

 

0.4

 

Other expense, net

 

$

(38.9

)

 

$

(1.4

)

 

$

(20.7

)