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Fair Value Measurements (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Available-for-sale securities:      
Available-for-sale securities $ 2,338,900,000 $ 2,338,900,000 $ 1,792,900,000
Trading securities:      
Trading securities 19,300,000 19,300,000 17,700,000
Fair Value Measurements (Textuals)      
Restricted investments 43,700,000 43,700,000 29,700,000
Asset-backed Securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 320,700,000 320,700,000 311,700,000
Certificates of deposit [Member]      
Available-for-sale securities:      
Available-for-sale securities 19,400,000 19,400,000 9,600,000
Commercial paper [Member]      
Available-for-sale securities:      
Available-for-sale securities 6,700,000 6,700,000 17,700,000
Corporate debt securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 863,700,000 863,700,000 911,400,000
Foreign government debt securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 35,500,000 35,500,000 16,500,000
Government-sponsored enterprise obligations [Member]      
Available-for-sale securities:      
Available-for-sale securities 177,200,000 177,200,000 203,700,000
Money market funds [Member]      
Available-for-sale securities:      
Available-for-sale securities 538,700,000 538,700,000 29,700,000
Mutual funds [Member]      
Available-for-sale securities:      
Available-for-sale securities 5,800,000 5,800,000 6,200,000
Publicly-traded equity securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 4,500,000 4,500,000 8,800,000
US government securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 366,700,000 366,700,000 277,600,000
Privately-held debt and redeemable preferred stock securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 1,789,900,000 1,789,900,000 1,748,200,000
Fair Value, Measurements, Recurring [Member]      
Derivative assets:      
Total assets measured at fair value 2,412,400,000 2,412,400,000 1,871,200,000
Liabilities measured at fair value:      
Other accrued liabilities (300,000) (300,000) (1,300,000)
Total liabilities measured at fair value (300,000) (300,000) (1,300,000)
Cash equivalents 555,200,000 555,200,000 3,400,000
Restricted investments 68,800,000 68,800,000 35,900,000
Short-term investments 587,100,000 587,100,000 527,100,000
Long-term investments 1,147,100,000 1,147,100,000 1,244,200,000
Prepaid expenses and other current assets 2,800,000 2,800,000 400,000
Other long-term assets 51,400,000 51,400,000 60,200,000
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]      
Derivative assets:      
Foreign exchange contracts 2,800,000 2,800,000 400,000
Liabilities measured at fair value:      
Derivative liabilities (300,000) (300,000) (1,300,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Derivative assets:      
Total assets measured at fair value 863,800,000 863,800,000 309,700,000
Liabilities measured at fair value:      
Other accrued liabilities 0 0 0
Total liabilities measured at fair value 0 0 0
Cash equivalents 495,000,000 495,000,000 0
Restricted investments 68,800,000 68,800,000 35,900,000
Short-term investments 122,400,000 122,400,000 108,200,000
Long-term investments 177,600,000 177,600,000 165,600,000
Prepaid expenses and other current assets 0 0 0
Other long-term assets 0 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign exchange contract [Member]      
Derivative assets:      
Foreign exchange contracts 0 0 0
Liabilities measured at fair value:      
Derivative liabilities 0 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivative assets:      
Total assets measured at fair value 1,497,200,000 1,497,200,000 1,501,300,000
Liabilities measured at fair value:      
Other accrued liabilities (300,000) (300,000) (1,300,000)
Total liabilities measured at fair value (300,000) (300,000) (1,300,000)
Cash equivalents 60,200,000 60,200,000 3,400,000
Restricted investments 0 0 0
Short-term investments 464,700,000 464,700,000 418,900,000
Long-term investments 969,500,000 969,500,000 1,078,600,000
Prepaid expenses and other current assets 2,800,000 2,800,000 400,000
Other long-term assets 0 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contract [Member]      
Derivative assets:      
Foreign exchange contracts 2,800,000 2,800,000 400,000
Liabilities measured at fair value:      
Derivative liabilities (300,000) (300,000) (1,300,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Derivative assets:      
Total assets measured at fair value 51,400,000 51,400,000 60,200,000
Liabilities measured at fair value:      
Other accrued liabilities 0 0 0
Total liabilities measured at fair value 0 0 0
Cash equivalents 0 0 0
Restricted investments 0 0 0
Short-term investments 0 0 0
Long-term investments 0 0 0
Prepaid expenses and other current assets 0 0 0
Other long-term assets 51,400,000 51,400,000 60,200,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contract [Member]      
Derivative assets:      
Foreign exchange contracts 0 0 0
Liabilities measured at fair value:      
Derivative liabilities 0 0 0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 320,700,000 320,700,000 311,700,000
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 320,700,000 320,700,000 311,700,000
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member]      
Available-for-sale securities:      
Available-for-sale securities 19,400,000 19,400,000 9,600,000
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 19,400,000 19,400,000 9,600,000
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]      
Available-for-sale securities:      
Available-for-sale securities 6,700,000 6,700,000 17,700,000
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 6,700,000 6,700,000 17,700,000
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 863,700,000 863,700,000 911,400,000
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 863,700,000 863,700,000 911,400,000
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 35,500,000 35,500,000 16,500,000
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 35,500,000 35,500,000 16,500,000
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member]      
Available-for-sale securities:      
Available-for-sale securities 177,200,000 177,200,000 203,700,000
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 177,200,000 177,200,000 203,700,000
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member]      
Available-for-sale securities:      
Available-for-sale securities 538,700,000 538,700,000 29,700,000
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 538,700,000 538,700,000 29,700,000
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member]      
Available-for-sale securities:      
Available-for-sale securities 5,800,000 5,800,000 6,200,000
Trading securities:      
Trading securities 19,300,000 19,300,000 17,700,000
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 5,800,000 5,800,000 6,200,000
Trading securities:      
Trading securities 19,300,000 19,300,000 17,700,000
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Trading securities:      
Trading securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Trading securities:      
Trading securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 4,500,000 4,500,000 8,800,000
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 4,500,000 4,500,000 8,800,000
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | US government securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 366,700,000 366,700,000 277,600,000
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 295,500,000 295,500,000 247,300,000
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 71,200,000 71,200,000 30,300,000
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member]      
Available-for-sale securities:      
Available-for-sale securities 2,338,900,000 2,338,900,000 1,792,900,000
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Available-for-sale securities:      
Available-for-sale securities 844,500,000 844,500,000 292,000,000
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Available-for-sale securities:      
Available-for-sale securities 1,494,400,000 1,494,400,000 1,500,900,000
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Available-for-sale securities:      
Available-for-sale securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member]      
Trading securities:      
Privately-held debt and redeemable preferred stock securities 51,400,000 51,400,000 60,200,000
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Trading securities:      
Privately-held debt and redeemable preferred stock securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Trading securities:      
Privately-held debt and redeemable preferred stock securities 0 0 0
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Trading securities:      
Privately-held debt and redeemable preferred stock securities 51,400,000 51,400,000 $ 60,200,000
Fair Value Measurements (Textuals)      
Purchases of privately-held investments $ 0 $ 10,500,000