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Financial Instruments (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Statement [Line Items] |  |
Noncurrent investments | $ 3,212.6 | $ 2,966.8
Carrying Amount |  |
Statement [Line Items] |  |
Cash equivalents | 2,379.5 | 2,097.9
Short-term investments | 90.1 | 24.2
Equity investments without readily determinable fair values | 548.1 | 373.9
Noncurrent investments | 3,212.6 | 2,966.8
Cost |  |
Statement [Line Items] |  |
Cash equivalents | 2,379.5 | 2,097.9
Fair Value |  |
Statement [Line Items] |  |
Cash equivalents | 2,379.5 | 2,097.9
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Cash equivalents | 2,361.0 | 2,097.9
Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Cash equivalents | 18.5 | 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 |  |
Statement [Line Items] |  |
Short-term investments | 25.7 | 9.9
Noncurrent investments | 137.0 | 78.7
U.S. government and agency securities | Cost |  |
Statement [Line Items] |  |
Short-term investments | 25.6 | 9.9
Noncurrent investments | 136.8 | 74.3
U.S. government and agency securities | Fair Value |  |
Statement [Line Items] |  |
Short-term investments | 25.7 | 9.9
Noncurrent investments | 137.0 | 78.7
U.S. government and agency securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Short-term investments | 25.7 | 9.9
Noncurrent investments | 137.0 | 78.7
U.S. government and agency securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
U.S. government and agency securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Corporate debt securities | Carrying Amount |  |
Statement [Line Items] |  |
Short-term investments | 43.7 | 2.8
Noncurrent investments | 235.3 | 137.0
Corporate debt securities | Cost |  |
Statement [Line Items] |  |
Short-term investments | 43.7 | 2.8
Noncurrent investments | 232.7 | 126.8
Corporate debt securities | Fair Value |  |
Statement [Line Items] |  |
Short-term investments | 43.7 | 2.8
Noncurrent investments | 235.3 | 137.0
Corporate debt securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Corporate debt securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Short-term investments | 43.7 | 2.8
Noncurrent investments | 235.3 | 137.0
Corporate debt securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Mortgage-backed securities | Carrying Amount |  |
Statement [Line Items] |  |
Short-term investments | 0.2 |
Noncurrent investments | 109.8 | 106.4
Mortgage-backed securities | Cost |  |
Statement [Line Items] |  |
Short-term investments | 0.2 |
Noncurrent investments | 108.1 | 101.4
Mortgage-backed securities | Fair Value |  |
Statement [Line Items] |  |
Short-term investments | 0.2 |
Noncurrent investments | 109.8 | 106.4
Mortgage-backed securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 |
Noncurrent investments | 0.0 | 0.0
Mortgage-backed securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Short-term investments | 0.2 |
Noncurrent investments | 109.8 | 106.4
Mortgage-backed securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 |
Noncurrent investments | 0.0 | 0.0
Asset-backed securities | Carrying Amount |  |
Statement [Line Items] |  |
Short-term investments | 6.2 | 1.2
Noncurrent investments | 23.1 | 24.3
Asset-backed securities | Cost |  |
Statement [Line Items] |  |
Short-term investments | 6.2 | 1.2
Noncurrent investments | 23.1 | 23.7
Asset-backed securities | Fair Value |  |
Statement [Line Items] |  |
Short-term investments | 6.2 | 1.2
Noncurrent investments | 23.1 | 24.3
Asset-backed securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Asset-backed securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Short-term investments | 6.2 | 1.2
Noncurrent investments | 23.1 | 24.3
Asset-backed securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Noncurrent investments | 0.0 | 0.0
Other securities | Carrying Amount |  |
Statement [Line Items] |  |
Short-term investments | 14.3 | 10.3
Other securities | Cost |  |
Statement [Line Items] |  |
Short-term investments | 14.3 | 10.3
Other securities | Fair Value |  |
Statement [Line Items] |  |
Short-term investments | 14.3 | 10.3
Other securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Other securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Short-term investments | 0.0 | 0.0
Other securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Short-term investments | 14.3 | 10.3
Other securities | Carrying Amount |  |
Statement [Line Items] |  |
Equity securities | 108.1 | 110.5
Other securities | Cost |  |
Statement [Line Items] |  |
Equity securities | 22.2 | 31.8
Other securities | Fair Value |  |
Statement [Line Items] |  |
Equity securities | 108.1 | 110.5
Other securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Equity securities | 0.0 | 0.0
Other securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Equity securities | 0.0 | 0.0
Other securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Equity securities | 108.1 | 110.5
Marketable equity securities | Carrying Amount |  |
Statement [Line Items] |  |
Equity securities | 1,279.7 | 1,664.2
Marketable equity securities | Cost |  |
Statement [Line Items] |  |
Equity securities | 487.0 | 311.6
Marketable equity securities | Fair Value |  |
Statement [Line Items] |  |
Equity securities | 1,279.7 | 1,664.2
Marketable equity securities | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Statement [Line Items] |  |
Equity securities | 1,279.7 | 1,664.2
Marketable equity securities | Fair Value | Significant Other Observable Inputs (Level 2) |  |
Statement [Line Items] |  |
Equity securities | 0.0 | 0.0
Marketable equity securities | Fair Value | Significant Unobservable Inputs (Level 3) |  |
Statement [Line Items] |  |
Equity securities | 0.0 | 0.0
Equity method investments | Carrying Amount |  |
Statement [Line Items] |  |
Equity method investments | $ 771.5 | $ 471.8

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