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Other Expense, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Other Expense, Net
Other expense, net, consisted of the following for the periods presented (in millions of dollars):
 
Year Ended December 31,
 
2019
 
2018
 
2017
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
)
 
—

Loss on extinguishment of debt
(20.3
)
 
—

 
—

All other, net
0.4

 
0.4

 
1.1

Other expense, net
$
(20.7
)
 
$
(0.9
)
 
$
—

____________
1. 
2017 includes a $0.3 million realized gain related to equity investments. Beginning in 2018 upon our adoption of ASU 2016-01, realized gains and losses on equity investments are no longer accounted for as available for sale securities (see Note 1 and Note 5 for additional details).