Quarterly Financial Results (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Quarterly Financial Results
Revenues	$ 2,810.5		$ 3,114.3	$ 2,747.8	$ 2,637.5	$ 2,623.6	$ 2,910.9	$ 2,570.7		$ 2,510.9	$ 11,310.1	$ 10,616.0	$ 9,833.0
Cost of Revenues	1,692.8		1,745.9	1,624.3	1,586.5	1,582.0	1,618.2	1,513.7		1,500.4	6,649.6	6,214.3	5,708.4
Gross Profit	1,117.7		1,368.4	1,123.5	1,051.0	1,041.6	1,292.7	1,057.0		1,010.5
Net Earnings from continuing operaitons	227.0	[1]	482.7	352.0	302.5	256.2	450.2	372.8	[2]	300.4	1,364.1	1,379.7	1,245.0
Basic Earnings Per Share from Continuing Operations	$ 0.47		$ 1.00	$ 0.73	$ 0.63	$ 0.53	$ 0.92	$ 0.77		$ 0.62	$ 2.83	$ 2.83	$ 2.52
Diluted Earnings Per Share from Continuing Operations	$ (0.47)	[1]	$ (0.99)	$ (0.72)	$ (0.62)	$ (0.52)	$ (0.91)	$ (0.76)	[2]	$ (0.61)	$ (2.80)	$ (2.80)	$ (2.50)
Goodwill, Impairment Loss											42.7	0	0
Gain (Loss) on Sale of Other Assets											$ (41.2)
Impairment of Goodwill
Quarterly Financial Results
Diluted Earnings Per Share from Continuing Operations											$ (0.09)
Gain (Loss) on Disposition of Assets
Quarterly Financial Results
Diluted Earnings Per Share from Continuing Operations											$ (0.08)

[1] Net earnings from continuing operations and diluted earnings per share from continuing operations includes the impact of a goodwill impairment charge related to ADP AdvancedMD, which decreased net earnings from continuing operations by $42.7 million and diluted earnings per share from continuing operations by $0.09.

[2] Net earnings from continuing operations and diluted earnings per share from continuing operations includes the impact of a gain on sale of assets related to the rights and obligations to resell a third-party management platform which increased net earnings from continuing operations by $41.2 million and diluted earnings per share from continuing operations by $0.08.