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Other Expense, Net (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Income and Expenses [Abstract] |
Other Expense, Net | Other expense, net, consisted of the following for the periods presented (in millions of dollars):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Interest income | $ | 0.6 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Net periodic postretirement benefit cost relating to Salaried VEBA | (6.5 | ) |  | (6.0 | ) |  | (4.5 | )
Realized gain on available for sale securities 1 | 4.4 |  |  | 5.4 |  |  | 3.2 |
Unrealized gain (loss) on equity securities | 0.7 |  |  | (1.0 | ) |  | — |
Loss on extinguishment of debt | (20.3 | ) |  | — |  |  | — |
All other, net | 0.4 |  |  | 0.4 |  |  | 1.1 |
Other expense, net | $ | (20.7 | ) |  | $ | (0.9 | ) |  | $ | — |
____________ 1. 2017 includes a $0.3 million realized gain related to equity investments. Beginning in 2018 upon our adoption of ASU 2016-01, realized gains and losses on equity investments are no longer accounted for as available for sale securities (see Note 1 and Note 5 for additional details).

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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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