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Other Expense, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Other Expense, Net Other expense, net, consisted of the following for each period presented (in millions of dollars):
 
Year Ended December 31,
 
2018
 
2017
 
2016
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
—

 
—

 
0.1

Realized gain on investments
6.1

 
3.4

 
0.8

Loss on extinguishment of debt1
—

 
—

 
(11.1
)
All other, net
(1.2
)
 
0.9

 
(0.1
)
Other expense, net
$
(0.9
)
 
$
—

 
$
(13.6
)
____________
1. 
Represents the loss on extinguishment of our 8.25% Senior Notes during the year ended December 31, 2016 which includes 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.