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Financial Instruments and Fair Value - Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 1,151.5 $ 1,126.4
Marketable equity securities 67.6 64.2
Fair Value 1,219.1 1,190.6
U.S. government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 486.7 469.5
Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 432.8 428.7
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 158.1 166.4
Certificates of deposit and term deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 73.9 61.8
Recurring Basis | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,565.9 1,546.4
Recurring Basis | Fair Value | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 346.8 355.8
Recurring Basis | Fair Value | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,183.9 1,190.6
Recurring Basis | Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 809.6 824.8
Recurring Basis | Fair Value | Level 1 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 260.3 296.1
Recurring Basis | Fair Value | Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 514.1 528.7
Recurring Basis | Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 756.3 721.6
Recurring Basis | Fair Value | Level 2 | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 86.5 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 669.8 661.9
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 | Money market funds | Cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 260.3 296.1
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 260.3 296.1
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 86.5 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 86.5 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 | U.S. government and agency securities | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 451.5 469.5
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 35.2 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 446.5 464.5
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 35.2 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 5.0 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 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 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 432.8 428.7
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 432.8 428.7
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 158.1 166.4
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 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 158.1 166.4
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 | Certificates of deposit and term deposits | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 73.9 61.8
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 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 73.9 61.8
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 67.6 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 67.6 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