Statements Of Consolidated Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Provision For Income Taxes Discontinued Operations	$ 1.7	$ 1.3
Direct pass-through costs, Professional Employer Organization revenues	$ 4,525.8	$ 3,935.3

Direct pass-through costs associated with PEO, primarily consisting of payroll wages and payroll taxes.

No definition available.

Name:	adp_DirectPassThroughCostsPEORevenues
Namespace Prefix:	adp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration