Income Taxes, Provision and Effective tax rate impacts (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Taxes
Provision for income taxes	$ (702.4)	$ (218.7)
Effective tax rate (as a percent)	42.70%	22.70%
Excess tax benefit from option exercises	$ 50.9	$ 20.1
Excess tax benefits related to stock-based compensation (as a percent)	3.10%	2.10%
Impact of acquisition-related expenses on the effective tax rate	1.20%	0.30%
Unfavorable determinations received from relevant tax authorities	$ 130.0
Additional tax obligations	$ 160.0
Accruals effect of increasing effective tax rate related to the additional tax obligations	17.60%