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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2011
Income Taxes  
Unrecognized Tax Benefits

Balance at December 31, 2010

   $ 157.1   

Additions for tax positions of the current year

     3.0   

Additions for tax positions of the prior year

     0.1   

Reductions for tax positions of prior years

     (9.5

Settlements during the year

     (1.7
        

Balance at June 30, 2011

   $ 149.0