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Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss carryforwards $ 20.7 $ 18.9
Research credit carryforwards 194.9 217.1
Stock-based compensation 25.7 24.8
Accruals and reserves 25.9 29.0
Lease liability 60.4 72.5
Convertible senior notes 26.5 37.1
Capitalized research expenditures 289.3 233.3
Other 0.6 0.2
Gross deferred tax assets 644.0 632.9
Valuation allowance (122.8) (116.3)
Total deferred tax assets, net of valuation allowance 521.2 516.6
Deferred tax liabilities:    
Fixed assets and intangible assets 25.9 21.8
Right-of-use assets 24.7 31.4
Other 3.9 3.0
Total deferred tax liability 54.5 56.2
Net deferred tax assets $ 466.7 $ 460.4