Income Taxes (Reconciliation of U.S. Federal Statutory Rate To Effective Tax Rate) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Provision for taxes at U.S. statutory rate	$ 796.1		$ 726.7	$ 735.7
Provision for taxes at U.S. statutory rate, percent	35.00%		35.00%	35.00%
State taxes, net of federal tax benefit	44.2		35.3	37.6
State taxes, net of federal tax benefit, percent	1.90%		1.70%	1.80%
U.S. tax on foreign income	26.8		85.3	51.4
U.S. tax on foreign income, percent	1.20%		4.20%	2.50%
Utilization of foreign tax credits	(27.5)		(94.4)	(51.7)
Utilization of foreign tax credits, percent	(1.20%)		(4.60%)	(2.50%)
Section 199 - Qualified production activities	(23.0)		(22.3)	(22.4)
Section 199 - Qualified production activities, percent	(1.00%)		(1.10%)	(1.10%)
Other	(44.6)	[1]	(12.6)	(24.1)
Other, percent	(2.00%)		(0.60%)	(1.10%)
Provision for income taxes from continuing operations	772.0		718.0	726.5
Effective Income Tax Rate, Continuing Operations	33.90%		34.60%	34.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount			$ 16.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent			0.70%

[1] (A) Fiscal 2014 includes $5.6 million for the tax impact of non tax-deductible separation cost related to the Company's planned separation of the Dealer Services business which increased our fiscal 2014 effective tax rate 0.2 percentage points. Fiscal 2013 includes $16.0 million for the tax impact of the non tax-deductible goodwill impairment related to ADP AdvancedMD which increased our fiscal 2013 effective tax rate 0.7 percentage points.