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Other (Expense) Income, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Other (Expense) Income, Net Other income (expense), net, consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Interest income
$
0.1

 
$
—

 
$
0.2

 
$
—

Net periodic postretirement benefit cost relating to Salaried VEBA
(1.4
)
 
(1.2
)
 
(4.5
)
 
(3.4
)
Gain on removal of Union VEBA net assets
—

 
(0.5
)
 
—

 
0.8

Realized gain on investments
1.6

 
0.8

 
4.7

 
2.2

All other income (expense), net
0.4

 
0.7

 
(0.1
)
 
0.9

Other income (expense), net
$
0.7

 
$
(0.2
)
 
$
0.3

 
$
0.5