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Other Income, Net
 3 Months Ended
Mar. 31, 2018
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income, Net
Other income, net, consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
March 31,
 
2018
 
2017
Interest income
$
0.1

 
$
—

Net periodic postretirement benefit cost relating to Salaried VEBA
(1.5
)
 
(1.1
)
Gain on removal of Union VEBA net assets
—

 
1.3

Realized gain on investments
1.6

 
0.7

All other expense, net
(0.1
)
 
(0.1
)
Other income, net
$
0.1

 
$
0.8