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Financial Instruments (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Noncurrent investments: |  |
Noncurrent investments | $ 2,966.8 | $ 1,962.4
Carrying Amount |  |
Statement [Line Items] |  |
Cash equivalents | 2,097.9 | 1,025.4
Short-term investments: |  |
Debt securities | 24.2 | 101.0
Noncurrent investments: |  |
Equity investments without readily determinable fair values | 373.9 | 405.0
Noncurrent investments | 2,966.8 | 1,962.4
Cost |  |
Statement [Line Items] |  |
Cash equivalents | 2,097.9 | 1,025.4
Fair Value |  |
Statement [Line Items] |  |
Cash equivalents | 2,097.9 | 1,025.4
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Cash equivalents | 2,097.9 | 1,025.4
Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Cash equivalents | 0.0 | 0.0
U.S. government and agency securities | Carrying Amount |  |
Short-term investments: |  |
Debt securities | 9.9 | 7.2
Noncurrent investments: |  |
Noncurrent investments, debt securities | 78.7 | 77.2
U.S. government and agency securities | Cost |  |
Short-term investments: |  |
Debt securities | 9.9 | 7.2
Noncurrent investments: |  |
Noncurrent investments, debt securities | 74.3 | 76.3
U.S. government and agency securities | Fair Value |  |
Short-term investments: |  |
Debt securities | 9.9 | 7.2
Noncurrent investments: |  |
Noncurrent investments, debt securities | 78.7 | 77.2
U.S. government and agency securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Short-term investments: |  |
Debt securities | 9.9 | 7.2
Noncurrent investments: |  |
Noncurrent investments, debt securities | 78.7 | 77.2
U.S. government and agency securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
U.S. government and agency securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Corporate debt securities | Carrying Amount |  |
Short-term investments: |  |
Debt securities | 2.8 | 81.4
Noncurrent investments: |  |
Noncurrent investments, debt securities | 137.0 | 271.1
Corporate debt securities | Cost |  |
Short-term investments: |  |
Debt securities | 2.8 | 81.1
Noncurrent investments: |  |
Noncurrent investments, debt securities | 126.8 | 267.8
Corporate debt securities | Fair Value |  |
Short-term investments: |  |
Debt securities | 2.8 | 81.4
Noncurrent investments: |  |
Noncurrent investments, debt securities | 137.0 | 271.1
Corporate debt securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Corporate debt securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Short-term investments: |  |
Debt securities | 2.8 | 81.4
Noncurrent investments: |  |
Noncurrent investments, debt securities | 137.0 | 271.1
Corporate debt securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Asset-backed securities | Carrying Amount |  |
Short-term investments: |  |
Debt securities | 1.2 | 2.6
Noncurrent investments: |  |
Noncurrent investments, debt securities | 24.3 | 30.0
Asset-backed securities | Cost |  |
Short-term investments: |  |
Debt securities | 1.2 | 2.6
Noncurrent investments: |  |
Noncurrent investments, debt securities | 23.7 | 29.6
Asset-backed securities | Fair Value |  |
Short-term investments: |  |
Debt securities | 1.2 | 2.6
Noncurrent investments: |  |
Noncurrent investments, debt securities | 24.3 | 30.0
Asset-backed securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Asset-backed securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Short-term investments: |  |
Debt securities | 1.2 | 2.6
Noncurrent investments: |  |
Noncurrent investments, debt securities | 24.3 | 30.0
Asset-backed securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Other securities | Carrying Amount |  |
Short-term investments: |  |
Debt securities | 10.3 | 9.8
Other securities | Cost |  |
Short-term investments: |  |
Debt securities | 10.3 | 9.8
Other securities | Fair Value |  |
Short-term investments: |  |
Debt securities | 10.3 | 9.8
Other securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Other securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Short-term investments: |  |
Debt securities | 0.0 | 0.0
Other securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Short-term investments: |  |
Debt securities | 10.3 | 9.8
Mortgage-backed securities | Carrying Amount |  |
Noncurrent investments: |  |
Noncurrent investments, debt securities | 106.4 | 101.1
Mortgage-backed securities | Cost |  |
Noncurrent investments: |  |
Noncurrent investments, debt securities | 101.4 | 99.6
Mortgage-backed securities | Fair Value |  |
Noncurrent investments: |  |
Noncurrent investments, debt securities | 106.4 | 101.1
Mortgage-backed securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Mortgage-backed securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Noncurrent investments: |  |
Noncurrent investments, debt securities | 106.4 | 101.1
Mortgage-backed securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Noncurrent investments: |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Other securities | Carrying Amount |  |
Noncurrent investments: |  |
Equity securities | 110.5 | 60.0
Other securities | Cost |  |
Noncurrent investments: |  |
Equity securities | 31.8 | 27.4
Other securities | Fair Value |  |
Noncurrent investments: |  |
Equity securities | 110.5 | 60.0
Other securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Noncurrent investments: |  |
Equity securities | 0.0 | 0.0
Other securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Noncurrent investments: |  |
Equity securities | 0.0 | 0.0
Other securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Noncurrent investments: |  |
Equity securities | 110.5 | 60.0
Marketable equity securities | Carrying Amount |  |
Noncurrent investments: |  |
Equity securities | 1,664.2 | 718.6
Marketable equity securities | Cost |  |
Noncurrent investments: |  |
Equity securities | 311.6 | 254.4
Marketable equity securities | Fair Value |  |
Noncurrent investments: |  |
Equity securities | 1,664.2 | 718.6
Marketable equity securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Noncurrent investments: |  |
Equity securities | 1,664.2 | 718.6
Marketable equity securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Noncurrent investments: |  |
Equity securities | 0.0 | 0.0
Marketable equity securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Noncurrent investments: |  |
Equity securities | 0.0 | 0.0
Equity method investments | Carrying Amount |  |
Noncurrent investments: |  |
Equity method investments | $ 471.8 | $ 299.4

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