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Other Income, Net
 9 Months Ended
Sep. 30, 2017
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income (Expense), 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,
 
2017
 
2016
 
2017
 
2016
Interest income
$
—

 
$
—

 
$
—

 
$
0.1

Realized gain on investments
0.8

 
0.1

 
2.2

 
0.4

Loss on extinguishment of debt1
—

 
—

 
—

 
(11.1
)
All other income (expense), net
0.7

 
(0.1
)
 
0.9

 
0.2

Other income (expense), net
$
1.5

 
$
—

 
$
3.1

 
$
(10.4
)

____________
1 
Represents the loss on extinguishment of our 8.25% Senior Notes during the nine months ended September 30, 2016, which included 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.