v3.25.2
Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 736.3 $ 1,328.3
Short-term investments 218.4 265.9
Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 99.9 130.0
U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 83.8 82.4
Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 20.8 29.3
Asset backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 8.4 18.9
U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 3.7 3.6
Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 1.8 1.7
Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 625.7 1,230.0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 625.7 1,230.0
Short-term investments 218.4 265.9
Assets, fair value disclosure 844.1 1,495.9
Fair Value, Measurements, Recurring | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 99.9 130.0
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 83.8 82.4
Fair Value, Measurements, Recurring | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 20.8 29.3
Fair Value, Measurements, Recurring | Asset backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 8.4 18.9
Fair Value, Measurements, Recurring | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 3.7 3.6
Fair Value, Measurements, Recurring | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 1.8 1.7
Fair Value, Measurements, Recurring | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 625.7 1,230.0
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 625.7 1,230.0
Short-term investments 0.0 0.0
Assets, fair value disclosure 625.7 1,230.0
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Asset backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 625.7 1,230.0
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0.0 0.0
Short-term investments 218.4 265.9
Assets, fair value disclosure 218.4 265.9
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 99.9 130.0
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 83.8 82.4
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 20.8 29.3
Fair Value, Measurements, Recurring | Level 2 | Asset backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 8.4 18.9
Fair Value, Measurements, Recurring | Level 2 | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 3.7 3.6
Fair Value, Measurements, Recurring | Level 2 | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 1.8 1.7
Fair Value, Measurements, Recurring | Level 2 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0.0 0.0
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0.0 0.0
Short-term investments 0.0 0.0
Assets, fair value disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Asset backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 0.0 $ 0.0