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Financial Instruments (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Statement [Line Items] |  |
Noncurrent investments | $ 3,052.2 | $ 2,901.8
Carrying Amount |  |
Statement [Line Items] |  |
Cash equivalents | 1,088.4 | 657.4
Short-term investments | 109.1 | 144.8
Equity investments without readily determinable fair values | 608.0 | 478.4
Noncurrent investments | 3,052.2 | 2,901.8
Carrying Amount | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 32.1 | 30.8
Noncurrent investments | 148.1 | 146.4
Carrying Amount | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 52.0 | 53.4
Noncurrent investments | 214.3 | 213.9
Carrying Amount | Mortgage-backed securities |  |
Statement [Line Items] |  |
Noncurrent investments | 157.3 | 149.2
Carrying Amount | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 2.0
Noncurrent investments | 53.5 | 50.6
Carrying Amount | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 25.0 | 58.6
Carrying Amount | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 197.4 | 398.6
Carrying Amount | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 711.3 | 683.6
Carrying Amount | Equity method investments |  |
Statement [Line Items] |  |
Equity method investments | 962.3 | 781.1
Cost |  |
Statement [Line Items] |  |
Cash equivalents | 1,088.4 | 657.4
Cost | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 32.3 | 31.1
Noncurrent investments | 161.0 | 163.2
Cost | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 52.1 | 53.5
Noncurrent investments | 226.6 | 235.8
Cost | Mortgage-backed securities |  |
Statement [Line Items] |  |
Noncurrent investments | 167.1 | 161.5
Cost | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 2.0
Noncurrent investments | 54.4 | 52.5
Cost | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 25.0 | 58.6
Cost | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 100.2 | 34.5
Cost | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 493.2 | 484.7
Estimate of Fair Value Measurement |  |
Statement [Line Items] |  |
Cash equivalents | 1,088.4 | 657.4
Estimate of Fair Value Measurement | U.S. government and agency securities |  |
Statement [Line Items] |  |
Short-term investments | 32.1 | 30.8
Noncurrent investments | 148.1 | 146.4
Estimate of Fair Value Measurement | Corporate debt securities |  |
Statement [Line Items] |  |
Short-term investments | 52.0 | 53.4
Noncurrent investments | 214.3 | 213.9
Estimate of Fair Value Measurement | Mortgage-backed securities |  |
Statement [Line Items] |  |
Noncurrent investments | 157.3 | 149.2
Estimate of Fair Value Measurement | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 2.0
Noncurrent investments | 53.5 | 50.6
Estimate of Fair Value Measurement | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 25.0 | 58.6
Estimate of Fair Value Measurement | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 197.4 | 398.6
Estimate of Fair Value Measurement | Marketable equity securities |  |
Statement [Line Items] |  |
Equity securities | 711.3 | 683.6
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Cash equivalents | 1,079.3 | 650.4
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 | 32.1 | 30.8
Noncurrent investments | 148.1 | 146.4
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] |  |
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
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 | 711.3 | 683.6
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Cash equivalents | 9.1 | 7.0
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 | 52.0 | 53.4
Noncurrent investments | 214.3 | 213.9
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Statement [Line Items] |  |
Noncurrent investments | 157.3 | 149.2
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Statement [Line Items] |  |
Short-term investments |  | 2.0
Noncurrent investments | 53.5 | 50.6
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 13.6 | 39.1
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 23.5 | 311.0
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] |  |
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
Noncurrent investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities |  |
Statement [Line Items] |  |
Short-term investments | 11.4 | 19.5
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities, noncurrent investments |  |
Statement [Line Items] |  |
Equity securities | 173.9 | 87.6
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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