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Other (Expense) Income, Net
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Other Income, Net
Other Income (Expense), Net
Other income (expense), net consisted of the following for each period presented (in millions of dollars):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Interest income
$
0.2

 
$
0.1

 
$
0.4

Realized gain on investments
3.4

 
0.8

 
0.8

Loss on extinguishment of debt1
—

 
(11.1
)
 
—

All other, net
0.9

 
(0.1
)
 
(3.0
)
Other income (expense), net
$
4.5

 
$
(10.3
)
 
$
(1.8
)
____________
1. 
Represents the loss on extinguishment of our 8.25% Senior Notes during the year ended December 31, 2016 which includes an $8.2 million premium paid to redeem the notes and a $2.9 million write-off of unamortized debt issuance costs associated with the notes.