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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2011
Other Income and Expenses [Abstract]  
Other income (expense), net
 
Year Ended December 31,
 
2011
 
2010
 
2009
Interest income
$
0.2

 
$
0.3

 
$
0.1

Unrealized gains (losses) on financial derivatives 1
4.0

 
(4.9
)
 
—

All other, net
0.1

 
0.4

 
(0.2
)
Other non-operating income (expense), net
$
4.3

 
$
(4.2
)
 
$
(0.1
)
____________

1 
See “Derivative Financial Instruments” in Note 1 for a discussion of accounting policy for such instruments.