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Other Income (Expense), Net
 3 Months Ended
Mar. 31, 2013
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income (Expense), Net
Other income (expense), net consisted of the following, for each period presented:
 
Quarter Ended
 
March 31,
 
2013
 
2012
Interest income
$
0.1

 
$
0.1

Unrealized gains on financial derivatives1
0.4

 
0.5

Realized gains on investments
0.5

 
—

All other, net
—

 
0.1

Other non-operating income, net
$
1.0

 
$
0.7

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