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Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Amortized cost  
Duration of one year or less $ 278.2
Duration of one through three years 1,458.0
Duration of three through five years 264.5
Duration of over five years 23.8
Total 2,024.5
Fair value  
Duration of one year or less 277.6
Duration of one through three years 1,458.6
Duration of three through five years 264.9
Duration of over five years 23.6
Total $ 2,024.7