Income Taxes - Effective Income Tax Reconciliation 2025 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
U.S. federal statutory income tax rate	$ 892.4
State tax, net of federal benefit	76.3
Other	12.6
Enactment of New Tax Laws	22.6
Effect of Cross Border Tax Laws
Net Controlled Foreign Corporation Tested Income	(32.6)
Other	2.3
Tax Credits
Research and Development Tax Credit	(54.8)
Nontaxable or Nondeductible Items
Stock-Based Compensation	(123.9)
Other	1.2
Changes in Unrecognized Tax Benefits	(11.0)
Total provision for income taxes	$ 738.3	$ 413.0	$ 334.7
Percent
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%
State tax, net of federal benefit	1.80%	1.75%	2.13%
Taxes on foreign earnings differential		(2.38%)	(1.96%)
Other	0.30%	0.03%	(0.03%)
Enactment of New Tax Laws	0.53%
Effect of Cross Border Tax Laws
Net Controlled Foreign Corporation Tested Income	(0.77%)
Other	0.05%
Tax Credits
Research and Development Tax Credit	(1.29%)
Nontaxable or Nondeductible Items
Stock-Based Compensation	(2.91%)	(4.96%)	(4.59%)
Other	0.02%
Changes in Unrecognized Tax Benefits	(0.26%)
Total Provision for Income Taxes	17.37%	12.65%	13.81%
Ireland
Amount
Statutory tax rate difference	$ (45.4)
Percent
Taxes on foreign earnings differential	(1.07%)
Other jurisdictions
Amount
Statutory tax rate difference	$ (1.4)
Percent
Taxes on foreign earnings differential	(0.03%)