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Comprehensive Income (Parenthetical) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Comprehensive Income [Abstract]        
Foreign currency transaction and translation adjustments, income taxes $ 32.4 $ (69.7) $ 98.3 $ (149.8)
Defined benefit plans adjustment, income taxes $ 0.6 $ 0.5 $ 1.2 $ 1.1