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Financial Instruments - Schedule of Fair Value Measurement (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments $ 3,222.7 $ 3,215.9
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,290.1 1,506.9
Short-term investments 127.4 154.8
Equity investments without readily determinable fair values 865.3 863.8
Equity method investments 1,148.6 1,142.7
Noncurrent investments 3,222.7 3,215.9
Carrying Amount | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 42.6 29.2
Noncurrent investments 131.2 140.2
Carrying Amount | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 59.4 65.3
Noncurrent investments 206.8 211.4
Carrying Amount | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments 179.8 165.3
Carrying Amount | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.6 0.6
Noncurrent investments 68.3 56.7
Carrying Amount | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 24.8 59.7
Carrying Amount | Other securities, noncurrent investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 161.0 150.3
Carrying Amount | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 461.7 485.5
Cost    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,290.1 1,506.9
Cost | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 43.1 29.3
Noncurrent investments 142.9 156.4
Cost | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 59.5 65.4
Noncurrent investments 217.0 225.0
Cost | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments 188.6 177.2
Cost | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.6 0.7
Noncurrent investments 68.6 57.5
Cost | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 24.8 59.7
Cost | Other securities, noncurrent investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 118.8 102.6
Cost | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 476.2 494.6
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,290.1 1,506.9
Estimate of Fair Value Measurement | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 42.6 29.2
Noncurrent investments 131.2 140.2
Estimate of Fair Value Measurement | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 59.4 65.3
Noncurrent investments 206.8 211.4
Estimate of Fair Value Measurement | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments 179.8 165.3
Estimate of Fair Value Measurement | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.6 0.6
Noncurrent investments 68.3 56.7
Estimate of Fair Value Measurement | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 24.8 59.7
Estimate of Fair Value Measurement | Other securities, noncurrent investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 161.0 150.3
Estimate of Fair Value Measurement | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 461.7 485.5
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,277.4 1,494.1
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 42.6 29.2
Noncurrent investments 131.2 140.2
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 461.7 485.5
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 12.7 12.8
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 59.4 65.3
Noncurrent investments 206.8 211.4
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments 179.8 165.3
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.6 0.6
Noncurrent investments 68.3 56.7
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 4.2 16.7
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities, noncurrent investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 6.3 6.3
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0.0 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0.0 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Noncurrent investments 0.0 0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 20.6 43.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities, noncurrent investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 154.7 144.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Marketable equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 0.0 $ 0.0