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Other Expense, Net | 12 Months Ended
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Dec. 31, 2018
Other Income and Expenses [Abstract] |
Other Expense, Net | Other Expense, Net Other expense, net, consisted of the following for each period presented (in millions of dollars):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Interest income | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.1 |
Net periodic postretirement benefit cost relating to Salaried VEBA | (6.1 | ) |  | (4.5 | ) |  | (3.4 | )
Gain on removal of Union VEBA net assets | — |  |  | — |  |  | 0.1 |
Realized gain on investments | 6.1 |  |  | 3.4 |  |  | 0.8 |
Loss on extinguishment of debt 1 | — |  |  | — |  |  | (11.1 | )
All other, net | (1.2 | ) |  | 0.9 |  |  | (0.1 | )
Other expense, net | $ | (0.9 | ) |  | $ | — |  |  | $ | (13.6 | )
____________ 1. Represents the loss on extinguishment of our 8.25% Senior Notes during the year ended December 31, 2016 which includes an $8.2 million premium paid to redeem the notes and a $2.9 million write-off of unamortized debt issuance costs associated with the notes.

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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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