Income Taxes (Reconciliation of U.S. Federal Statutory Rate To Effective Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for taxes at U.S. statutory rate	$ 668.4	$ 631.2	$ 640.5
Provision for taxes at U.S. statutory rate, percent	21.00%	21.00%	28.10%
State taxes, net of federal tax benefit	$ 85.6	$ 80.7	$ 58.1
State taxes, net of federal tax benefit, percent	2.70%	2.70%	2.50%
U.S. tax on foreign income	$ 0.0	$ 0.0	$ 12.0
U.S. tax on foreign income, percent	0.00%	0.00%	0.50%
Utilization of foreign tax credits	$ 0.0	$ 0.0	$ (19.6)
Utilization of foreign tax credits, percent	0.00%	0.00%	(0.90%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount	$ 0.0	$ 0.0	$ (31.9)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent	0.00%	0.00%	(1.40%)
Income Tax Reconciliation Resolution Of Tax Matters	$ 0.0	$ 0.0	$ (33.3)
Effective Income Tax Rate Reconciliation Resolution Of Tax Matters	0.00%	0.00%	(1.50%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 0.0	$ 0.0	$ (253.3)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.00%	0.00%	(11.10%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	$ 44.9	$ 46.9	$ 0.0
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	1.40%	1.60%	0.00%
Excess tax benefit - Stock-based compensation	$ (26.9)	$ (29.8)	$ (26.7)
Excess tax benefit - Stock-based compensation, percent	(0.80%)	(1.00%)	(1.20%)
Other	$ (35.6)	$ (16.2)	$ 51.9
Other, percent	(1.20%)	(0.60%)	2.40%
Provision for income taxes from continuing operations	$ 716.1	$ 712.8	$ 397.7
Effective Income Tax Rate Reconciliation, Percent	22.50%	23.70%	17.40%
Effective Income Tax Rate Reconciliation, Valuation Allowance Release on Foreign Tax Credits, Amount	$ (20.3)	$ 0.0	$ 0.0
Effective Income Tax Rate Reconciliation, Valuation Allowance Release on Foreign Tax Credits, Percent	(0.60%)	0.00%	0.00%