Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Intangible assets	$ 244.9	$ 273.9
Reserves and accruals not currently deductible	146.4	135.2
Deferred revenue	1,130.8	566.3
Tax credits	134.0	130.2
Lease financing obligation	17.7	13.7
Capitalized research and development expenses	417.0	634.5
Stock-based compensation	53.4	38.6
Net operating losses	19.7	25.9
Other	2.8	3.6
Gross deferred tax assets	2,166.7	1,821.9
Valuation allowance	(195.8)	(179.8)
Total deferred tax assets	1,970.9	1,642.1
Deferred tax liabilities:
US tax on foreign earnings	(167.5)	(189.8)
Right of use asset	(15.7)	(11.6)
Other	(14.1)	(0.3)
Total deferred tax liabilities	(197.3)	(201.7)
Net deferred tax assets	$ 1,773.6	$ 1,440.4