Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Taxes
Provision for income taxes	$ (130.6)	$ (144.5)	$ (247.8)	$ (278.7)
Effective tax rate	21.90%	23.30%	21.40%	23.50%
Excess tax benefit from option exercises	$ 11.9	$ 7.5	$ 29.0	$ 11.3
Excess tax benefit, impact on effective tax rate	(2.00%)	(1.20%)	(2.50%)	(1.00%)
Impact of gain associated with the bargain purchase acquisition on the effective tax rate	(0.20%)		(0.10%)
Impact of acquisition-related expenses on the effective tax rate	0.10%		0.10%