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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