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Other (Expense) Income, Net
 9 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
Other (Expense) Income, Net Other (Expense) Income, Net
Other (expense) income, net, consisted of the following for the periods presented (in millions of dollars):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
Interest income
$
0.2

 
$
0.1

 
$
0.5

 
$
0.2

Net periodic postretirement benefit cost relating to Salaried VEBA
(1.6
)
 
(1.4
)
 
(4.9
)
 
(4.5
)
Realized gain on available for sale securities
0.9

 
1.6

 
3.0

 
4.3

Unrealized gain (loss) on equity securities
0.1

 
0.1

 
0.6

 
(0.3
)
All other (expense) income, net
(0.4
)
 
0.3

 
0.4

 
0.6

Other (expense) income, net
$
(0.8
)
 
$
0.7

 
$
(0.4
)
 
$
0.3