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Financial Instruments (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Statement [Line Items] |  |
Noncurrent investments | $ 2,901.8 | $ 3,212.6
Carrying Amount |  |
Statement [Line Items] |  |
Cash equivalents | 657.4 | 2,379.5
Short-term investments | 144.8 | 90.1
Equity investments without readily determinable fair values | 478.4 | 548.1
Noncurrent investments | 2,901.8 | 3,212.6
Carrying Amount | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 30.8 | 25.7
Noncurrent investments | 146.4 | 137.0
Carrying Amount | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 53.4 | 43.7
Noncurrent investments | 213.9 | 235.3
Carrying Amount | Mortgage-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 0.2
Noncurrent investments | 149.2 | 109.8
Carrying Amount | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments | 2.0 | 6.2
Noncurrent investments | 50.6 | 23.1
Carrying Amount | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 58.6 | 14.3
Carrying Amount | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 398.6 | 108.1
Carrying Amount | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 683.6 | 1,279.7
Carrying Amount | Equity method investments |  |
Statement [Line Items] |  |
Equity method investments | 781.1 | 771.5
Cost |  |
Statement [Line Items] |  |
Cash equivalents | 657.4 | 2,379.5
Cost | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 31.1 | 25.6
Noncurrent investments | 163.2 | 136.8
Cost | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 53.5 | 43.7
Noncurrent investments | 235.8 | 232.7
Cost | Mortgage-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 0.2
Noncurrent investments | 161.5 | 108.1
Cost | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments | 2.0 | 6.2
Noncurrent investments | 52.5 | 23.1
Cost | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 58.6 | 14.3
Cost | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 34.5 | 22.2
Cost | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 484.7 | 487.0
Estimate of Fair Value Measurement |  |
Statement [Line Items] |  |
Cash equivalents | 657.4 | 2,379.5
Estimate of Fair Value Measurement | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 30.8 | 25.7
Noncurrent investments | 146.4 | 137.0
Estimate of Fair Value Measurement | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 53.4 | 43.7
Noncurrent investments | 213.9 | 235.3
Estimate of Fair Value Measurement | Mortgage-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 0.2
Noncurrent investments | 149.2 | 109.8
Estimate of Fair Value Measurement | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments | 2.0 | 6.2
Noncurrent investments | 50.6 | 23.1
Estimate of Fair Value Measurement | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 58.6 | 14.3
Estimate of Fair Value Measurement | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 398.6 | 108.1
Estimate of Fair Value Measurement | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 683.6 | 1,279.7
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Cash equivalents | 650.4 | 2,361.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 30.8 | 25.7
Noncurrent investments | 146.4 | 137.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 683.6 | 1,279.7
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Cash equivalents | 7.0 | 18.5
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 53.4 | 43.7
Noncurrent investments | 213.9 | 235.3
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 0.2
Noncurrent investments | 149.2 | 109.8
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments | 2.0 | 6.2
Noncurrent investments | 50.6 | 23.1
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 39.1 | 0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 311.0 | 0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 19.5 | 14.3
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 87.6 | 108.1
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | $ 0.0 | $ 0.0

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