v3.26.1
Financial Instruments and Fair Value - Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 1,499.3 $ 1,328.7
Fair Value 1,533.8 1,426.9
U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 561.7 514.6
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 516.7 368.8
Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 314.7 354.9
Certificates of deposit and term deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 106.2 90.4
Recurring Basis | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,743.2 1,640.5
Recurring Basis | Fair Value | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 209.4 213.6
Recurring Basis | Fair Value | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,134.7 1,087.2
Recurring Basis | Fair Value | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 399.1 339.7
Recurring Basis | Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 739.3 775.9
Recurring Basis | Fair Value | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 159.8 174.4
Recurring Basis | Fair Value | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 438.8 479.7
Recurring Basis | Fair Value | Level 1 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 140.7 121.8
Recurring Basis | Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,003.9 864.6
Recurring Basis | Fair Value | Level 2 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 49.6 39.2
Recurring Basis | Fair Value | Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 695.9 607.5
Recurring Basis | Fair Value | Level 2 | Long-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 258.4 217.9
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 158.5 174.4
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 158.5 174.4
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 | U.S. government and agency securities | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1.3 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 404.3 383.5
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 157.4 131.1
Recurring Basis | Fair Value | U.S. government and agency securities | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1.3 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 404.3 381.5
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 140.7 121.8
Recurring Basis | Fair Value | U.S. government and agency securities | 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 | 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 2.0
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 16.7 9.3
Recurring Basis | Fair Value | U.S. government and agency securities | 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 | 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 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 19.4 38.1
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 19.4 38.1
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 | Corporate debt securities | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 1.1
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 275.0 160.2
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 241.7 208.6
Recurring Basis | Fair Value | Corporate debt securities | 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 | 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 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0.0 1.1
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 275.0 160.2
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 241.7 208.6
Recurring Basis | Fair Value | Corporate debt securities | 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 | 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 | Commercial paper | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 314.7 354.9
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 314.7 354.9
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 | Certificates of deposit and term deposits | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 30.2 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 106.2 90.4
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 30.2 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 106.2 90.4
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 | Marketable equity securities | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securities 34.5 98.2
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 34.5 98.2
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