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Cash, Cash Equivalents and Investments - Available for Sale Securities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Available-for-sale securities:    
Available-for-sale securities, amortized cost $ 2,928.6 $ 2,722.8
Available-for-sale securities, gross unrealized gains 4.6 1.4
Available-for-sale securities, gross unrealized losses 0 (0.8)
Available-for-sale securities, estimated fair value 2,933.2 2,723.4
Trading securities:    
Trading securities, amortized cost 12.6 [1] 9.3 [1]
Trading securities, gross unrealized gains 0 [1] 0 [1]
Trading securities, gross unrealized losses 0 [1] 0 [1]
Trading securities, estimated fair value 12.6 [1] 9.3 [1]
Available-for-sale and Trading Investments [Abstract]    
Total investments, amortized cost 2,941.2 2,732.1
Total investments, gross unrealized gains 4.6 1.4
Total investments, gross unrealized losses 0 (0.8)
Total investments, estimated fair value 2,945.8 2,732.7
Cash Equivalents [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 1,605.7 1,350.7
Available-for-sale securities, gross unrealized gains 0 0
Available-for-sale securities, gross unrealized losses 0 0
Available-for-sale securities, estimated fair value 1,605.7 1,350.7
Short-term investments [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 438.2 640.9
Available-for-sale securities, gross unrealized gains 1.1 0.4
Available-for-sale securities, gross unrealized losses 0 0
Available-for-sale securities, estimated fair value 439.3 641.3
Long-term investments [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 897.3 740.5
Available-for-sale securities, gross unrealized gains 3.5 1.0
Available-for-sale securities, gross unrealized losses 0 (0.8)
Available-for-sale securities, estimated fair value 900.8 740.7
Debt Securities [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 2,925.6 2,722.8
Available-for-sale securities, gross unrealized gains 4.0 1.4
Available-for-sale securities, gross unrealized losses 0 (0.8)
Available-for-sale securities, estimated fair value 2,929.6 2,723.4
Asset-backed Securities [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 175.4 124.7
Available-for-sale securities, gross unrealized gains 0.4 0.1
Available-for-sale securities, gross unrealized losses 0 (0.1)
Available-for-sale securities, estimated fair value 175.8 124.7
Certificates of Deposit [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 26.9 31.8
Available-for-sale securities, gross unrealized gains 0 0
Available-for-sale securities, gross unrealized losses 0 0
Available-for-sale securities, estimated fair value 26.9 31.8
Commercial Paper [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 3.0 10.0
Available-for-sale securities, gross unrealized gains 0 0
Available-for-sale securities, gross unrealized losses 0 0
Available-for-sale securities, estimated fair value 3.0 10.0
Corporate Debt Securities [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 566.2 508.2
Available-for-sale securities, gross unrealized gains 3.1 1.0
Available-for-sale securities, gross unrealized losses 0 (0.5)
Available-for-sale securities, estimated fair value 569.3 508.7
Foreign Government Debt Securities [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 10.0  
Available-for-sale securities, gross unrealized gains 0  
Available-for-sale securities, gross unrealized losses 0  
Available-for-sale securities, estimated fair value 10.0  
Government-Sponsored Enterprise Obligations [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 251.2 430.8
Available-for-sale securities, gross unrealized gains 0.3 0.3
Available-for-sale securities, gross unrealized losses 0 (0.1)
Available-for-sale securities, estimated fair value 251.5 431.0
Money Market Funds [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 1,430.2 1,316.2
Available-for-sale securities, gross unrealized gains 0 0
Available-for-sale securities, gross unrealized losses 0 0
Available-for-sale securities, estimated fair value 1,430.2 1,316.2
US Government Debt Securities [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 462.7 301.1
Available-for-sale securities, gross unrealized gains 0.2 0
Available-for-sale securities, gross unrealized losses 0 (0.1)
Available-for-sale securities, estimated fair value 462.9 301.0
Equity Securities [Member]
   
Available-for-sale securities:    
Available-for-sale securities, amortized cost 3.0  
Available-for-sale securities, gross unrealized gains 0.6  
Available-for-sale securities, gross unrealized losses 0  
Available-for-sale securities, estimated fair value 3.6  
Corporate Debt Securities [Member]
   
Schedule of Available For Sale Investments And Publicly Traded Securities [Line Items]    
Restricted investments $ 1.9 $ 1.6
[1] Balance includes the Company's non-qualified deferred compensation plan assets. For additional information, see Note 12, Employee Benefit Plans, under the section Deferred Compensation Plan.