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Other (Expense) Income, Net
 12 Months Ended
Dec. 31, 2016
Other Income and Expenses [Abstract]  
Other Income, Net
Other (Expense) Income, Net
Other (expense) income, net consisted of the following for each period presented (in millions of dollars):
 
Year Ended December 31,
 
2016
 
2015
 
2014
Interest income
$
0.1

 
$
0.4

 
$
1.0

Unrealized gain on financial derivatives1
—

 
—

 
3.6

Realized gain on investments
0.8

 
0.8

 
1.0

Loss on extinguishment of debt2
(11.1
)
 
—

 
—

All other, net3
(0.1
)
 
(3.0
)
 
1.1

Other (expense) income, net
$
(10.3
)
 
$
(1.8
)
 
$
6.7

____________
1. 
Reflects our net unrealized gain related to the Option Assets and Bifurcated Conversion Feature, which are discussed in Note 3. See Note 1 for a discussion of our accounting policy for such instruments.
2. 
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.
3. 
See Note 3 for a discussion of the loss we recognized on our repurchase of 8.25% Senior Notes during the year ended December 31, 2015.