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Other Income (Expense), Net (Tables)
 9 Months Ended
Sep. 30, 2015
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other income, net consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
Interest income
$
0.1

 
$
0.3

 
$
0.3

 
$
0.8

Unrealized gains on financial derivatives1
—

 
2.2

 
—

 
3.6

Realized gains on investments
—

 
—

 
0.5

 
0.4

All other (expense) income, net
(1.0
)
 
(0.3
)
 
(0.9
)
 
1.1

Other (expense) income, net
$
(0.9
)
 
$
2.2

 
$
(0.1
)
 
$
5.9

______________________
1 
See "Hedges Relating to the Convertible Notes" in Note 8 for discussion of such instruments.