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Other Expense, Net
 9 Months Ended
Sep. 30, 2016
Other Income and Expenses [Abstract]  
Other (Expense) Income, Net
Other Expense, Net
Other expense, net consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Interest income
$
—

 
$
0.1

 
$
0.1

 
$
0.3

Realized gain on investments
0.1

 
—

 
0.4

 
0.5

Loss on extinguishment of debt1
—

 
—

 
(11.1
)
 
—

All other, net
(0.1
)
 
(1.0
)
 
0.2

 
(0.9
)
Other expense, net
$
—

 
$
(0.9
)
 
$
(10.4
)
 
$
(0.1
)

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