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Income Taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets: |  |
Capitalized research and development expenses | $ 845.3 | $ 0.0
Deferred compensation | 416.2 | 406.6
Accrued expenses | 235.6 | 262.1
Fixed assets and intangible assets | 227.6 | 257.5
Deferred revenue | 0.0 | 57.3
Tax attribute carryforwards | 41.3 | 6.1
Other | 15.9 | 10.8
Total deferred tax assets | 1,781.9 | 1,000.4
Deferred tax liabilities: |  |
Unrealized gains on investments | (58.2) | (123.5)
Net deferred tax assets | $ 1,723.7 | $ 876.9

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