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Other Income (Expense), Net
 3 Months Ended
Mar. 31, 2015
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income, Net
Other income, net consisted of the following, for each period presented (in millions of dollars):
 
Quarter Ended
 
March 31,
 
2015
 
2014
Interest income
$
0.2

 
$
0.3

Unrealized gains on financial derivatives1
—

 
0.9

Realized gains on investments
0.3

 
0.2

All other, net
(0.1
)
 
0.5

Other income, net
$
0.4

 
$
1.9

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