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Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill, Gross Carrying Value $ 9,424.3 $ 9,026.6
Goodwill, Accumulated Amortization 580.1 570.3
Goodwill, Net Carrying Value 8,844.2 8,456.3
Intangible assets:, Gross Carrying Value 954.1 885.3
Intangible assets:, Accumulated Amortization 498.0 416.9
Intangible assets:, Net Carrying Value 456.1 468.4
Goodwill [Roll Forward]    
Goodwill, Balance January 1 8,456.3 7,809.1
Goodwill, Acquisitions 301.1 728.3
Goodwill, Dispositions (2.7) (12.1)
Goodwill, Foreign currency translation 89.5 (69.0)
Goodwill, Balance December 31 8,844.2 8,456.3
Goodwill, impairment losses 0  
Goodwill, accumulated impairment losses 0  
Goodwill, acquisitions of noncontrolling interests 25.6 140.9
Purchased and internally developed software
   
Intangible assets:, Gross Carrying Value 283.3 270.0
Intangible assets:, Accumulated Amortization 218.8 210.3
Intangible assets:, Net Carrying Value 64.5 59.7
Customer related and other
   
Intangible assets:, Gross Carrying Value 670.8 615.3
Intangible assets:, Accumulated Amortization 279.2 206.6
Intangible assets:, Net Carrying Value $ 391.6 $ 408.7