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Other Expense, Net (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Income And Expenses [Abstract] |
Other Expense, Net | Other expense, net, consisted of the following (in millions of dollars):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Interest income |  | $ | 0.6 |  |  | $ | 0.6 |  |  | $ | 0.3 |
Net periodic postretirement benefit cost relating to Salaried VEBA |  |  | (4.7 | ) |  |  | (6.5 | ) |  |  | (6.0 | )
Realized gain on available for sale securities |  |  | 2.0 |  |  |  | 4.4 |  |  |  | 5.4 |
Unrealized gain (loss) on equity securities |  |  | 0.7 |  |  |  | 0.7 |  |  |  | (1.0 | )
Loss on extinguishment of debt |  |  | — |  |  |  | (20.3 | ) |  |  | — |
All other, net |  |  | — |  |  |  | 0.4 |  |  |  | 0.4 |
Other expense, net |  | $ | (1.4 | ) |  | $ | (20.7 | ) |  | $ | (0.9 | )

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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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