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Cash, Cash Equivalents and Investments - Available for Sale Securities (Details) (USD $)
In Millions
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Available-for-sale securities:  
Available-for-sale securities, amortized cost$ 1,398.0$ 999.0
Available-for-sale securities, gross unrealized gains1.33.1
Available-for-sale securities, gross unrealized losses(1.5)(0.5)
Available-for-sale securities, estimated fair value1,397.81,001.6
Trading securities:  
Trading securities, amortized cost10.1[1]8.1[1]
Trading securities, gross unrealized gains0[1]0[1]
Trading securities, gross unrealized losses0[1]0[1]
Trading securities, estimated fair value10.1[1]8.1[1]
Available-for-sale and Trading Investments [Abstract]  
Total investments, amortized cost1,408.11,007.1
Total investments, gross unrealized gains1.33.1
Total investments, gross unrealized losses(1.5)(0.5)
Total investments, estimated fair value1,407.91,009.7
Debt Securities [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost1,398.0999.0
Available-for-sale securities, gross unrealized gains1.33.1
Available-for-sale securities, gross unrealized losses(1.5)(0.5)
Available-for-sale securities, estimated fair value1,397.81,001.6
US Government Debt Securities [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost361.6158.2
Available-for-sale securities, gross unrealized gains00.2
Available-for-sale securities, gross unrealized losses(0.1)0
Available-for-sale securities, estimated fair value361.5158.4
US Government-sponsored Enterprises Debt Securities [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost368.2213.8
Available-for-sale securities, gross unrealized gains0.30.4
Available-for-sale securities, gross unrealized losses(0.1)(0.2)
Available-for-sale securities, estimated fair value368.4214.0
Foreign Government Debt Securities [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost2.446.8
Available-for-sale securities, gross unrealized gains00.2
Available-for-sale securities, gross unrealized losses00
Available-for-sale securities, estimated fair value2.447.0
Certificates of Deposit [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost38.020.9
Available-for-sale securities, gross unrealized gains00.1
Available-for-sale securities, gross unrealized losses00
Available-for-sale securities, estimated fair value38.021.0
Commercial Paper [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost 9.5
Available-for-sale securities, gross unrealized gains 0
Available-for-sale securities, gross unrealized losses 0
Available-for-sale securities, estimated fair value 9.5
Asset-backed Securities [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost111.790.1
Available-for-sale securities, gross unrealized gains0.30
Available-for-sale securities, gross unrealized losses(0.1)(0.1)
Available-for-sale securities, estimated fair value111.990.0
Corporate Debt Securities [Member]
  
Available-for-sale securities:  
Available-for-sale securities, amortized cost516.1459.7
Available-for-sale securities, gross unrealized gains0.72.2
Available-for-sale securities, gross unrealized losses(1.2)(0.2)
Available-for-sale securities, estimated fair value515.6461.7
Short-term investments [Member]
  
Available-for-sale and Trading Investments [Abstract]  
Total investments, amortized cost632.3473.6
Total investments, gross unrealized gains0.20.9
Total investments, gross unrealized losses(0.1)0
Total investments, estimated fair value632.4474.5
Long-term investments [Member]
  
Available-for-sale and Trading Investments [Abstract]  
Total investments, amortized cost775.8533.5
Total investments, gross unrealized gains1.12.2
Total investments, gross unrealized losses(1.4)(0.5)
Total investments, estimated fair value$ 775.5$ 535.2
[1]Balance includes the Company's non-qualified deferred compensation plan assets. For additional information, see Note 12, Employee Benefits, under the section Deferred Compensation Plan.