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Other Expense, Net | 12 Months Ended
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Dec. 31, 2019
Other Income and Expenses [Abstract] |
Other Expense, Net | 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 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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