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Other (Expense) Income, Net (Tables)
 6 Months Ended
Jun. 30, 2019
Other Income and Expenses [Abstract]  
Other Income, Net
Other (expense) income, net, consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
Interest income
$
0.1

 
$
—

 
$
0.3

 
$
0.1

Net periodic postretirement benefit cost relating to Salaried VEBA
(1.6
)
 
(1.6
)
 
(3.3
)
 
(3.1
)
Realized gain on available for sale securities
1.2

 
1.5

 
2.4

 
3.1

Unrealized (loss) gain on equity securities
—

 
(0.4
)
 
0.5

 
(0.4
)
All other income (expense), net
0.2

 
—

 
0.5

 
(0.1
)
Other (expense) income, net
$
(0.1
)
 
$
(0.5
)
 
$
0.4

 
$
(0.4
)