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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2012
Income Taxes [Abstract]  
Reconciliation between the statutory United States federal income tax rate and the Company's effective income tax rate
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2012     2011     2012     2011  

Statutory rate

    35.0     35.0     35.0     35.0

State taxes

    2.0       2.6       2.0       2.5  

Tax settlements

    0.0       0.0       (1.2     0.0  

Changes in tax reserves

    (0.2     0.8       (0.1     1.0  

Foreign tax adjustments

    (0.1     (0.6     (0.1     (0.6

Other, net

    0.4       2.1       (0.3     1.5  
   

 

 

   

 

 

   

 

 

   

 

 

 

Effective rate

    37.1     39.9     35.3     39.4
   

 

 

   

 

 

   

 

 

   

 

 

 
Change in unrecognized tax benefits
                 
    Six Months Ended  
    June 30,  
    2012     2011  
    (in millions)  

Beginning balance

  $ 52.5     $ 36.8  

Additions for tax positions related to the current year

    2.0       1.8  

Additions for tax positions of prior years

    —         14.5  

Reductions for tax positions of prior years

    (1.1     —    

Settlements

    (3.3     (0.7

Expiration of statute of limitations

    (0.1     (0.1
   

 

 

   

 

 

 

Ending balance

  $ 50.0     $ 52.3