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Other Income, Net
 3 Months Ended
Mar. 31, 2019
Other Income and Expenses [Abstract]  
Other Income, Net Other Income, Net
Other income, net, consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
March 31,
 
2019
 
2018
Interest income
$
0.2

 
$
0.1

Net periodic postretirement benefit cost relating to Salaried VEBA
(1.6
)
 
(1.5
)
Realized gain on investments
1.2

 
1.6

All other income (expense), net
0.7

 
(0.1
)
Other income, net
$
0.5

 
$
0.1