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Other Income (Expense), Net
 9 Months Ended
Sep. 30, 2022
Other Income and Expenses [Abstract]  
Other Income (Expense), Net

8. Other Income (Expense), Net

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

 

 

 

Quarter Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2022

 

 

2021

 

 

2022

 

 

2021

 

Interest income

 

$

0.4

 

 

$

0.1

 

 

$

0.6

 

 

$

0.2

 

Net periodic postretirement benefit cost

 

 

(1.4

)

 

 

(1.2

)

 

 

(4.3

)

 

 

(3.0

)

Unrealized (loss) gain on equity securities

 

 

(0.3

)

 

 

—

 

 

 

(1.4

)

 

 

—

 

Gain (loss) on extinguishment of debt

 

 

—

 

 

 

—

 

 

 

—

 

 

 

(35.9

)

Gain (loss) on disposition of property, plant and equipment

 

 

8.4

 

 

 

—

 

 

 

6.3

 

 

 

(0.1

)

Post-acquisition funding received from Alcoa Corporation1

 

 

6.0

 

 

 

—

 

 

 

6.0

 

 

 

—

 

All other, net

 

 

(0.4

)

 

 

(0.1

)

 

 

0.2

 

 

 

0.6

 

Other income (expense), net

 

$

12.7

 

 

$

(1.2

)

 

$

7.4

 

 

$

(38.2

)

 

1
Reimbursement received for repairs and maintenance expenditures on certain machinery and equipment that we had purchased from Alcoa Corporation in connection with our March 31, 2021 acquisition of the Warrick rolling mill.