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Other (Expense) Income, Net
 6 Months Ended
Jun. 30, 2021
Other Income And Expenses [Abstract]  
Other (Expense) Income, Net

11. Other (Expense) Income, Net

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

 

 

 

Quarter Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2021

 

 

2020

 

 

2021

 

 

2020

 

Interest income

 

$

—

 

 

$

0.2

 

 

$

0.1

 

 

$

0.3

 

Net periodic postretirement benefit cost

 

 

(1.2

)

 

 

(1.2

)

 

 

(1.8

)

 

 

(2.4

)

Realized gain on available for sale securities

 

 

—

 

 

 

0.6

 

 

 

—

 

 

 

2.1

 

Unrealized gain on equity securities

 

 

0.1

 

 

 

0.7

 

 

 

—

 

 

 

0.1

 

(Loss) gain on extinguishment of debt

 

 

(35.9

)

 

 

—

 

 

 

(35.9

)

 

 

—

 

All other, net

 

 

0.4

 

 

 

0.2

 

 

 

0.6

 

 

 

(0.4

)

Other (expense) income, net

 

$

(36.6

)

 

$

0.5

 

 

$

(37.0

)

 

$

(0.3

)