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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