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Other (Expense) Income, Net | 6 Months Ended
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Jun. 30, 2018
Other Income and Expenses [Abstract] |
Other (Expense) Income, Net | Other (Expense) Income, Net Other (expense) income, net, consisted of the following for each period presented (in millions of dollars):
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Interest income | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Net periodic postretirement benefit cost relating to Salaried VEBA | (1.6 | ) |  | (1.1 | ) |  | (3.1 | ) |  | (2.2 | )
Gain on removal of Union VEBA net assets | — |  |  | — |  |  | — |  |  | 1.3 |
Realized gain on investments | 1.5 |  |  | 0.7 |  |  | 3.1 |  |  | 1.4 |
All other (expense) income, net | (0.4 | ) |  | 0.3 |  |  | (0.5 | ) |  | 0.2 |
Other (expense) income, net | $ | (0.5 | ) |  | $ | (0.1 | ) |  | $ | (0.4 | ) |  | $ | 0.7 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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