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Financial Instruments and Fair Value - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 1,318.7 $ 1,126.4
Marketable equity securities 98.1 64.2
Fair Value 1,416.8 1,190.6
Certificates of deposit and term deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 102.3 61.8
U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 560.5 469.5
Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 370.5 428.7
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 285.4 166.4
Recurring Basis | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,625.8 1,546.4
Recurring Basis | Fair Value | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 209.0 355.8
Recurring Basis | Fair Value | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,127.7 1,190.6
Recurring Basis | Fair Value | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 289.1 0.0
Recurring Basis | Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 819.0 824.8
Recurring Basis | Fair Value | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 170.5 296.1
Recurring Basis | Fair Value | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 535.2 528.7
Recurring Basis | Fair Value | Level 1 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 113.3 0.0
Recurring Basis | Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 806.8 721.6
Recurring Basis | Fair Value | Level 2 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 38.5 59.7
Recurring Basis | Fair Value | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 592.5 661.9
Recurring Basis | Fair Value | Level 2 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 175.8 0.0
Recurring Basis | Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 0.0 0.0
Recurring Basis | Fair Value | Level 3 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Level 3 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Money market funds | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 170.5 296.1
Recurring Basis | Fair Value | Money market funds | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 170.5 296.1
Recurring Basis | Fair Value | Money market funds | Level 2 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Money market funds | Level 3 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Commercial paper | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 34.0 59.7
Recurring Basis | Fair Value | Commercial paper | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Commercial paper | Level 2 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 34.0 59.7
Recurring Basis | Fair Value | Commercial paper | Level 3 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4.5 0.0
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 102.3 61.8
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Level 2 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4.5 0.0
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 102.3 61.8
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Level 3 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Certificates of deposit and term deposits | Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | U.S. government and agency securities | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 437.1 469.5
Recurring Basis | Fair Value | U.S. government and agency securities | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 123.4 0.0
Recurring Basis | Fair Value | U.S. government and agency securities | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 437.1 464.5
Recurring Basis | Fair Value | U.S. government and agency securities | Level 1 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 113.3 0.0
Recurring Basis | Fair Value | U.S. government and agency securities | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 5.0
Recurring Basis | Fair Value | U.S. government and agency securities | Level 2 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 10.1 0.0
Recurring Basis | Fair Value | U.S. government and agency securities | Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | U.S. government and agency securities | Level 3 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Commercial paper | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 370.5 428.7
Recurring Basis | Fair Value | Commercial paper | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Commercial paper | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 370.5 428.7
Recurring Basis | Fair Value | Commercial paper | Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Corporate debt securities | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 119.7 166.4
Recurring Basis | Fair Value | Corporate debt securities | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 165.7 0.0
Recurring Basis | Fair Value | Corporate debt securities | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Corporate debt securities | Level 1 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Corporate debt securities | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 119.7 166.4
Recurring Basis | Fair Value | Corporate debt securities | Level 2 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 165.7 0.0
Recurring Basis | Fair Value | Corporate debt securities | Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Corporate debt securities | Level 3 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 0.0
Recurring Basis | Fair Value | Marketable equity securities | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 98.1 64.2
Recurring Basis | Fair Value | Marketable equity securities | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 98.1 64.2
Recurring Basis | Fair Value | Marketable equity securities | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 0.0 0.0
Recurring Basis | Fair Value | Marketable equity securities | Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities $ 0.0 $ 0.0