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Other Income, Net (Tables)
 12 Months Ended
Dec. 31, 2015
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other (expense) income, net consisted of the following for each period presented (in millions of dollars):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Interest income
$
0.4

 
$
1.0

 
$
0.4

Unrealized gain on financial derivatives1
—

 
3.6

 
3.2

Realized gain on investments
0.8

 
1.0

 
1.4

Distribution from third-party trust2
—

 
—

 
0.6

All other, net3
(3.0
)
 
1.1

 
—

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

 
$
5.6

____________
1. 
See Note 1 for a discussion of our accounting policy for such instruments.
2. 
See Note 12 for discussion of the distribution.
3. 
See Note 3 for a discussion of the loss we recognized on our repurchase of Senior Notes during the year ended December 31, 2015.