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Other Expense, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Income and Expenses [Abstract] |  |  |
Interest income | $ 0.6 | $ 0.3 | $ 0.2
Net periodic postretirement benefit cost relating to Salaried VEBA | (6.5) | (6.0) | (4.5)
Realized gain on available for sale securities1 | 4.4 | 5.4 | 3.2
Unrealized gain (loss) on equity securities | 0.7 | (1.0) | 0.0
Loss on extinguishment of debt | (20.3) | 0.0 | 0.0
All other, net | 0.4 | 0.4 | 1.1
Other expense, net | $ (20.7) | $ (0.9) | 0.0
Realized gain related to equity investments |  |  | $ 0.3

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