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Other (Expense) Income, Net (Tables) | 9 Months Ended
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Sep. 30, 2023
Other Income and Expenses [Abstract] |
Other (Expense) Income, Net | The following table presents the components of Other (expense) income, net (in millions of dollars):
|  | Quarter Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Interest income |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 1.2 |  |  | $ | 0.6 |
Net periodic postretirement benefit cost |  |  | (2.2 | ) |  |  | (1.4 | ) |  |  | (6.1 | ) |  |  | (4.3 | )
Unrealized (loss) gain on equity securities |  |  | (0.1 | ) |  |  | (0.3 | ) |  |  | 0.2 |  |  |  | (1.4 | )
(Loss) gain on disposition of property, plant and equipment |  |  | (0.2 | ) |  |  | 8.4 |  |  |  | 14.0 |  |  |  | 6.3 |
Post-acquisition funding received from Alcoa Corporation 1 |  |  | — |  |  |  | 6.0 |  |  |  | — |  |  |  | 6.0 |
All other, net |  |  | (0.3 | ) |  |  | (0.4 | ) |  |  | (0.4 | ) |  |  | 0.2 |
Other (expense) income, net |  | $ | (2.2 | ) |  | $ | 12.7 |  |  | $ | 8.9 |  |  | $ | 7.4 |
\ 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 the Warrick rolling mill.

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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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