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Other Income, Net (Tables)
 6 Months Ended
Jun. 30, 2017
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other income (expense), net, consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Interest income
$
—

 
$
—

 
$
—

 
$
0.1

Realized gain on investments
0.7

 
0.3

 
1.4

 
0.3

Loss on extinguishment of debt1
—

 
(11.1
)
 
—

 
(11.1
)
All other income, net
0.3

 
0.1

 
0.2

 
0.3

Other income (expense), net
$
1.0

 
$
(10.7
)
 
$
1.6

 
$
(10.4
)

____________
1 
Represents the loss on extinguishment of our 8.25% Senior Notes during the quarter ended June 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.