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Other (Expense) Income, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other Income and Expenses [Abstract] |  |  |  |
Interest income | $ 0.1 | $ 0.0 | $ 0.2 | $ 0.0
Net periodic postretirement benefit cost relating to Salaried VEBA | (1.4) | (1.2) | (4.5) | (3.4)
Gain on removal of Union VEBA net assets | 0.0 | (0.5) | 0.0 | 0.8
Realized gain on investments | 1.6 | 0.8 | 4.7 | 2.2
All other income (expense), net | 0.4 | 0.7 | (0.1) | 0.9
Other income (expense), net | $ 0.7 | $ (0.2) | $ 0.3 | $ 0.5

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References No definition available. + Details
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