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Other Income, Net | 9 Months Ended
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Sep. 30, 2017
Other Income and Expenses [Abstract] |
Other Income (Expense), Net | Other Income (Expense), Net Other income (expense), net, consisted of the following for each period presented (in millions of dollars):
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Interest income | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |
Realized gain on investments | 0.8 |  |  | 0.1 |  |  | 2.2 |  |  | 0.4 |
Loss on extinguishment of debt 1 | — |  |  | — |  |  | — |  |  | (11.1 | )
All other income (expense), net | 0.7 |  |  | (0.1 | ) |  | 0.9 |  |  | 0.2 |
Other income (expense), net | $ | 1.5 |  |  | $ | — |  |  | $ | 3.1 |  |  | $ | (10.4 | )
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1 | Represents the loss on extinguishment of our 8.25% Senior Notes during the nine months ended September 30, 2016, which included 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://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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