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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Reconciliation between the statutory United States federal income tax rate and the Company's effective income tax rate
                                 
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2011   2010   2011   2010
Statutory rate
    35.0 %     35.0 %     35.0 %     35.0 %
State taxes
    3.2       1.2       2.8       2.1  
Tax settlements
    0.0       11.6       0.0       6.5  
Changes in tax reserves
    (0.9 )     (16.9 )     0.3       (12.7 )
Foreign tax adjustments
    2.1       (0.9 )     0.3       0.4  
Other, net
    0.6       2.5       1.2       2.8  
 
                               
Effective rate
    40.0 %     32.5 %     39.6 %     34.1 %
 
                               
Change in unrecognized tax benefits
                 
    Nine Months Ended
    September 30,
    2011   2010
    (in millions)
Beginning balance
  $ 36.8     $ 40.1  
Additions for tax positions related to the current year
    2.9       2.6  
Additions for tax positions of prior years
    15.1       6.0  
Reductions for tax positions of prior years
    (0.1 )     (5.3 )
Settlements
    (3.5 )     (8.1 )
Expiration of statute of limitations
    (0.5 )     (0.5 )
 
           
Ending balance
  $ 50.7     $ 34.8