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Other Expense, Net (Tables)
 9 Months Ended
Sep. 30, 2021
Other Income And Expenses [Abstract]  
Other Expense, Net

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

 

 

 

Quarter Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2021

 

 

2020

 

 

2021

 

 

2020

 

Interest income

 

$

0.1

 

 

$

0.2

 

 

$

0.2

 

 

$

0.5

 

Net periodic postretirement benefit cost

 

 

(1.2

)

 

 

(1.1

)

 

 

(3.0

)

 

 

(3.5

)

Realized gain on available for sale securities

 

 

—

 

 

 

—

 

 

 

—

 

 

 

2.1

 

Unrealized gain on equity securities

 

 

—

 

 

 

0.3

 

 

 

—

 

 

 

0.4

 

Gain (loss) on extinguishment of debt

 

 

—

 

 

 

—

 

 

 

(35.9

)

 

 

—

 

All other, net

 

 

(0.1

)

 

 

0.1

 

 

 

0.5

 

 

 

(0.3

)

Other expense, net

 

$

(1.2

)

 

$

(0.5

)

 

$

(38.2

)

 

$

(0.8

)