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Acquisition-related Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Definite-Lived Intangible Assets [Line Items]    
Definite-Lived Intangible Assets, Gross $ 9,772.4 $ 9,637.2
Accumulated Amortization (3,381.4) (3,169.3)
Definite-Lived Intangible Assets, Net 6,391.0 6,467.9
Indefinite-lived Intangible Assets by Major Class [Line Items]    
Indefinite-Lived Intangible Assets 1,348.1 1,348.0
Acquisition-related Intangible Assets, Gross 11,120.5 10,985.2
Acquisition-related Intangible Assets, net of Accumulated Amortization 7,739.1 7,815.9
Definite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
Definite-Lived Intangible Assets, Net $ 6,391.0 $ 6,467.9