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Income Taxes (Tables)
3 Months Ended
Mar. 31, 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  
    March 31,  
    2012     2011  

Statutory rate

    35.0     35.0

State taxes

    1.9       2.4  

Changes in tax reserves, net of settlements

    (4.6     1.2  

Other, net

    0.6       0.2  
   

 

 

   

 

 

 

Effective rate

    32.9     38.8
   

 

 

   

 

 

 
Change in unrecognized tax benefits
                 
    Three Months Ended  
    March 31,  
    2012     2011  
    (in millions)  

Beginning balance

  $ 52.5     $ 36.8  

Additions for tax positions related to the current year

    1.0       0.9  

Additions for tax positions of prior years

    —         2.6  

Reductions for tax positions of prior years

    (1.1     —    

Settlements

    (3.0     —    

Expiration of statute of limitations

    (0.1     (0.1
   

 

 

   

 

 

 

Ending balance

  $ 49.3     $ 40.2