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Other Income (Expense), Net (Tables) | 12 Months Ended
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Dec. 31, 2022
Other Income and Expenses [Abstract] |
Other Income (Expense), Net | 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 Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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