Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Taxes
Provision for income taxes	$ (115.2)	$ (150.4)	$ (363.0)	$ (429.2)
Effective tax rate	18.20%	23.10%	20.30%	23.40%
Excess tax benefit from option exercises	$ 38.3	$ 10.6	$ 67.3	$ 21.9
Excess tax benefit, impact on effective tax rate	(6.00%)	(1.60%)	(3.80%)	(1.20%)
Impact of gain associated with the bargain purchase acquisition on the effective tax rate			(0.10%)
Impact of acquisition-related expenses on the effective tax rate	0.20%	0.20%	0.10%	0.10%