Statements Of Consolidated Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Direct pass-through costs, Professional Employer Organization revenues	$ 7,217.4adp_DirectPassThroughCostsPEORevenues	$ 6,140.4adp_DirectPassThroughCostsPEORevenues	$ 12,953.6adp_DirectPassThroughCostsPEORevenues	$ 11,087.6adp_DirectPassThroughCostsPEORevenues

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