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Other Income (Expense), Net | 12 Months Ended
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Dec. 31, 2022
Other Income and Expenses [Abstract] |
Other Income (Expense), Net | 13. Other Income (E xpense), 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 Corporation 1 |  |  | 6.0 |  |  |  | — |  |  |  | — |
All other, net |  |  | (0.1 | ) |  |  | 0.6 |  |  |  | 0.2 |
Other income (expense), net |  | $ | 6.4 |  |  | $ | (38.9 | ) |  | $ | (1.4 | )
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 Warrick.

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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI https://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI https://asc.fasb.org/topic&trid=49130413 + Details
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