Financial Data By Segment (Tables)

12 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Employer Services		PEO Services		Other			Client Fund Interest			Total
Year ended June 30, 2015
Revenues from continuing operations	$	8,897.3	$	2,647.2	$	(12.4	)	$	(593.6	)	$	10,938.5
Earnings from continuing operations before income taxes	2,694.2		303.6		(333.5		)	(593.6		)	2,070.7
Assets from continuing operations	27,554.7		377.7		5,178.1			—			33,110.5
Capital expenditures from continuing operations	95.2		1.3		74.7			—			171.2
Depreciation and amortization	226.6		1.2		50.1			—			277.9
Year ended June 30, 2014
Revenues from continuing operations	$	8,506.0	$	2,270.9	$	(0.9	)	$	(549.6	)	$	10,226.4
Earnings from continuing operations before income taxes	2,517.3		234.4		(322.9		)	(549.6		)	1,879.2
Assets from continuing operations	21,736.3		472.6		7,420.7			—			29,629.6
Capital expenditures from continuing operations	90.8		0.9		69.3			—			161.0
Depreciation and amortization	216.6		1.2		48.8			—			266.6
Year ended June 30, 2013
Revenues from continuing operations	$	7,899.0	$	1,973.2	$	1.7		$	(431.9	)	$	9,442.0
Earnings from continuing operations before income taxes	2,215.7		199.7		(273.4		)	(431.9		)	1,710.1
Assets from continuing operations	24,462.8		411.4		5,167.5			—			30,041.7
Capital expenditures from continuing operations	76.1		0.6		52.7			—			129.4
Depreciation and amortization	190.3		1.2		59.7			—			251.2

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	United States		Europe		Canada		Other		Total
Year ended June 30, 2015
Revenues from continuing operations	$	9,101.8	$	1,086.6	$	320.8	$	429.3	$	10,938.5
Assets from continuing operations	$	28,138.1	$	2,059.5	$	2,488.9	$	424.0	$	33,110.5
Year ended June 30, 2014
Revenues from continuing operations	$	8,354.2	$	1,132.7	$	334.7	$	404.8	$	10,226.4
Assets from continuing operations	$	25,228.8	$	2,057.2	$	1,898.6	$	445.0	$	29,629.6
Year ended June 30, 2013
Revenues from continuing operations	$	7,699.6	$	1,032.5	$	339.2	$	370.7	$	9,442.0
Assets from continuing operations	$	25,958.7	$	1,732.9	$	1,958.7	$	391.4	$	30,041.7