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Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 18.9 $ 40.8
Research credit carryforwards 217.1 268.9
Stock-based compensation 24.8 24.1
Accruals and reserves 29.0 36.8
Lease liability 72.5 141.8
Convertible senior notes 37.1 47.5
Capitalized research expenditures 233.3 123.9
Other 0.2 0.6
Gross deferred tax assets 632.9 684.4
Valuation allowance (116.3) (111.6)
Total deferred tax assets, net of valuation allowance 516.6 572.8
Deferred tax liabilities:    
Fixed assets and intangible assets 21.8 14.4
Right-of-use assets 31.4 59.5
Other 3.0 0.2
Total deferred tax liability 56.2 74.1
Net deferred tax assets $ 460.4 $ 498.7