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Other Expense, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Income and Expenses [Abstract] |  |  |
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 | 0.0 | 0.0 | 0.1
Realized gain on investments | 6.1 | 3.4 | 0.8
Loss on extinguishment of debt | 0.0 | 0.0 | (11.1)
All other, net | (1.2) |  | (0.1)
All other, net |  | 0.9 |
Other expense, net | $ (0.9) | $ 0.0 | (13.6)
Senior Notes | Senior Notes Due 2020 |  |  |
Debt Instrument, Redemption |  |  |
Redemption Premium |  |  | 8.2
Write off of Deferred Debt Issuance Cost |  |  | $ 2.9

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