Statements Of Consolidated Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Direct pass-through costs, Professional Employer Organization revenues	$ 5,736.2	$ 4,947.2

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