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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2011
Stockholders' Equity  
Accumulated Other Comprehensive Income/(Loss)
             
    June 30, 2011     December 31, 2010  
Foreign currency translation adjustments $ (21.9 ) $ (12.9 )
Changes in benefit plan net gain/(loss) and prior service (cost)/credit   2.7     2.8  
Unrealized gain on available for sale investments   8.1     2.2  
Changes in fair values of derivatives qualifying as cash flow hedges   (1.2 )   (1.7 )
Total accumulated other comprehensive loss $ (12.3 ) $ (9.6 )