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Other Income (Expense), Net (Tables) | 12 Months Ended
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Dec. 31, 2023
Other Income and Expenses [Abstract] |
Other Income (Expense), Net | The following table presents the components of Other income (expense), net, (in millions of dollars):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Interest income |  | $ | 1.7 |  |  | $ | 1.3 |  |  | $ | 0.2 |
Net periodic postretirement benefit cost |  |  | (8.4 | ) |  |  | (5.6 | ) |  |  | (4.1 | )
Unrealized gain (loss) on equity securities |  |  | 0.6 |  |  |  | (1.2 | ) |  |  | (0.2 | )
Loss on extinguishment of debt 1 |  |  | — |  |  |  | — |  |  |  | (35.9 | )
Gain on disposition of property, plant and equipment |  |  | 13.8 |  |  |  | 6.0 |  |  |  | 0.5 |
Post-acquisition funding received from Alcoa Corporation 2 |  |  | — |  |  |  | 6.0 |  |  |  | — |
All other, net |  |  | (0.3 | ) |  |  | (0.1 | ) |  |  | 0.6 |
Other income (expense), net |  | $ | 7.4 |  |  | $ | 6.4 |  |  | $ | (38.9 | )
1. In May 2021, we redeemed in full our 6.50% Senior Notes at a redemption price of 108.83% of the $350.0 million principal amount plus $1.3 million of accrued and unpaid interest for a total net cash outflow of $382.2 million. Upon redemption of the 6.50% Senior Notes, we recorded a loss on extinguishment of debt of $35.9 million, which included the premium payment of $30.9 million and a write-off of the remaining unamortized premium and debt issuance costs of $5.0 million. 2. Reimbursement received for repairs and maintenance expenditures on certain machinery and equipment that we had purchased from Alcoa 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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