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Income Taxes - Schedule Of Deferred Tax Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Intangible assets $ 420.9 $ 342.8
Capitalized research and development expenditures 306.4 172.5
Research and development credits 193.2 156.7
Share-based compensation expense 135.1 121.3
Swiss tax credits 122.4 0.0
Expenses deducted in later years for tax purposes 55.9 57.5
Lease liabilities 16.5 16.6
Net operating losses 2.8 6.4
Net unrealized losses on available-for-sale securities and other 9.2 45.5
Gross deferred tax assets 1,262.4 919.3
Valuation allowance (269.8) (168.6)
Deferred tax assets 992.6 750.7
Deferred tax liabilities:    
Property, plant, and equipment (60.3) (64.1)
Right-of-use assets (11.8) (11.8)
Intangible assets (9.8) (9.3)
Other (0.2) (1.0)
Deferred tax liabilities (82.1) (86.2)
Net deferred tax assets $ 910.5 $ 664.5