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Other Expense, Net | 12 Months Ended
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Dec. 31, 2020
Other Income And Expenses [Abstract] |
Other Expense, Net | 13. 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 The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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