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Derivatives and Hedging Activities (Tables)
6 Months Ended
Jun. 30, 2011
Derivatives and Hedging Activities [Abstract]  
Fair value of forward contract recorded in balance sheet
                 
    June 30,     December 31,  
    2011     2010  
    (Dollars in millions)  
Prepaid expenses and other assets
  $ 47.3     $ 20.3  
Other assets
    82.3       44.6  
Accrued expenses
    8.4       22.7  
Other non-current liabilities
    2.3       11.6  
Amounts recognized in other comprehensive income and reclassified from AOCI into earnings
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
            (Dollars in millions)          
Amount of gain/(loss) recognized in OCI, net of tax for the three and six months ended June 30, 2011 of $(7) and $(29.7), respectively; net of tax for the three and six months ended June 30, 2010 of $26.3 and $44.3, respectively
  $ 14.0     $ (57.9 )   $ 62.0     $ (88.5 )
Amount of gain/(loss) reclassified from AOCI into earnings
  $ 6.7     $ (11.7 )   $ 7.9     $ (16.9 )