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Other Income (Expense), Net
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Interest income
$
—

 
$
0.2

 
$
0.2

 
$
0.5

Unrealized gains on financial derivatives1
—

 
0.5

 
—

 
1.4

Realized gains on investments
0.2

 
0.2

 
0.5

 
0.4

All other, net
0.2

 
0.9

 
0.1

 
1.4

Other income, net
$
0.4

 
$
1.8

 
$
0.8

 
$
3.7

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