Quarterly Financial Results (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Summarized Quarterly Results of Continuing Operations [Abstract]
Revenues	$ 3,073.7		$ 3,320.0	$ 2,977.9	$ 2,834.8	$ 2,802.8		$ 3,109.3	$ 2,742.8	$ 2,632.7	$ 12,206.5	$ 11,287.6	$ 10,595.4
Cost of Revenues	1,845.6		1,884.4	1,769.8	1,721.7	1,689.9		1,743.2	1,621.6	1,583.7	7,221.4	6,638.5	6,203.9
Gross Profit	1,228.1		1,435.6	1,208.1	1,113.1	1,112.9		1,366.1	1,121.2	1,049.0
Net Earnings from continuing operaitons	288.7	[1]	510.4	375.8	327.7	224.0	[2]	481.6	350.9	301.7	1,502.6	1,358.1	1,375.2
Basic Earnings Per Share from Continuing Operations	$ 0.60		$ 1.07	$ 0.79	$ 0.68	$ 0.46		$ 1.00	$ 0.73	$ 0.62	$ 3.14	$ 2.81	$ 2.82
Diluted Earnings Per Share from Continuing Operations											$ 0.09
Separation costs											14.9	0	0
Separation Cost EPS Impact											$ 0.03
Goodwill, Impairment Loss											$ 0	$ 42.7	$ 0

[1] Net earnings from continuing operations, basic earnings per share from continuing operations and diluted earnings per share from continuing operations include the impact of separation costs related to the planned separation of the Company's Dealer Services business, which decreased net earnings from continuing operations by $14.9 million and both basic and diluted earnings per share from continuing operations by $0.03.

[2] 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 both basic and diluted earnings per share from continuing operations by $0.09.