Other Income (Expense), Net

12 Months Ended

Dec. 31, 2022

Other Income and Expenses [Abstract]

Other Income (Expense), Net

13. Other Income (Expense), Net

The following table presents the components of Other income (expense), net, (in millions of dollars):

	Year Ended December 31,
	2022			2021			2020
Interest income	$	1.3		$	0.2		$	0.6
Net periodic postretirement benefit cost		(5.6	)		(4.1	)		(4.7	)
Realized gain on available for sale securities		—			—			2.0
Unrealized (loss) gain on equity securities		(1.2	)		(0.2	)		0.7
Gain (loss) on extinguishment of debt – Note 9		—			(35.9	)		—
Gain (loss) on disposition of property, plant and equipment		6.0			0.5			(0.2	)
Post-acquisition funding received from Alcoa Corporation1		6.0			—			—
All other, net		(0.1	)		0.6			0.2
Other income (expense), net	$	6.4		$	(38.9	)	$	(1.4	)

1Reimbursement 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 Warrick.