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Noncontrolling Interests (Tables)
 6 Months Ended
Jun. 30, 2011
Noncontrolling Interests [Abstract]  
Changes in the noncontrolling interests
                 
    Six months ended  
    June 30,  
    2011     2010  
    (Dollars in millions)  
Balance at January 1
  $ 40.9     $ 46.6  
Distributions to noncontrolling interests
    (8.1 )     (11.3 )
Comprehensive income:
               
Net income attributable to noncontrolling interests
    3.5       5.0  
Other comprehensive income, net of tax
    —       —  
 
           
Comprehensive income
    3.5       5.0  
 
           
Balance at June 30
  $ 36.3     $ 40.3