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Other (Expense) Income, Net
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Other (Expense) Income, Net
Other (Expense) 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,
 
2018
 
2017
 
2018
 
2017
Interest income
$
—

 
$
—

 
$
0.1

 
$
—

Net periodic postretirement benefit cost relating to Salaried VEBA
(1.6
)
 
(1.1
)
 
(3.1
)
 
(2.2
)
Gain on removal of Union VEBA net assets
—

 
—

 
—

 
1.3

Realized gain on investments
1.5

 
0.7

 
3.1

 
1.4

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

 
(0.5
)
 
0.2

Other (expense) income, net
$
(0.5
)
 
$
(0.1
)
 
$
(0.4
)
 
$
0.7