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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 18.1 $ 46.4
Capitalized research and development expenses 233.4 211.9
Tax credits 71.4 61.1
Share-based compensation 27.0 16.8
Fixed and intangible assets 279.8 34.4
Accrued liabilities and reserves 91.0 105.3
Convertible debt 20.6 9.3
Total gross deferred tax assets 741.3 485.2
Less: valuation allowance (264.3) (78.7)
Total net deferred tax assets 477.0 406.5
Deferred tax liabilities:    
Fixed assets and acquired intangibles assets (60.4) (69.9)
Other 0.0 (0.3)
Total deferred tax liabilities (60.4) (70.2)
Net deferred tax assets (liabilities) $ 416.6 $ 336.3