Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Income tax reconciliation
Provision for income taxes at U.S. statutory rate	$ 141.2	$ 146.2	$ 121.7
Increase (decrease) in Provision for income taxes from:
State taxes, net of federal tax	23.9	15.2	11.3
Foreign tax differential	(1.5)	4.8	3.2
Valuation allowances	0.3	1.0	2.4
Stock-based compensation - excess tax benefits (“ETB”)	(18.1)	(16.9)	(15.6)
Tax Credits and Foreign-Derived Intangible Income Deduction (“FDII”)	(16.6)	(8.8)	(9.2)
Other	3.9	7.2	3.3
Total Provision for income taxes	$ 133.1	$ 148.7	$ 117.0
Tax rate reconciliation (percent)
Provision for income taxes at U.S. statutory rate	21.00%	21.00%	21.00%
Increase (decrease) in Provision for income taxes from:
State taxes, net of federal tax	3.60%	2.20%	1.90%
Foreign tax differential	(0.20%)	0.70%	0.60%
Valuation allowances	0.00%	0.10%	0.40%
Stock-based compensation - excess tax benefits (“ETB”)	(2.70%)	(2.40%)	(2.70%)
Tax Credits and Foreign-Derived Intangible Income Deduction (“FDII”)	(2.50%)	(1.30%)	(1.60%)
Other	0.60%	1.00%	0.60%
Total Provision for income taxes	19.80%	21.40%	20.20%