Financial Data By Segment (Tables)

12 Months Ended

Jun. 30, 2017

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, 2017
Revenues from continuing operations	$	9,535.2	$	3,483.6	$	(10.6	)	$	(628.4	)	$	12,379.8
Earnings from continuing operations before income taxes	2,921.3		448.6		(210.4		)	(628.4		)	2,531.1
Assets from continuing operations	30,107.7		586.8		6,485.5			—			37,180.0
Capital expenditures from continuing operations	83.0		0.2		165.8			—			249.0
Depreciation and amortization	247.3		1.3		67.5			—			316.1
Year ended June 30, 2016
Revenues from continuing operations	$	9,211.9	$	3,073.1	$	1.9		$	(619.1	)	$	11,667.8
Earnings from continuing operations before income taxes	2,800.4		371.2		(317.8		)	(619.1		)	2,234.7
Assets from continuing operations	36,637.5		534.6		6,497.9			—			43,670.0
Capital expenditures from continuing operations	71.1		1.0		93.6			—			165.7
Depreciation and amortization	230.7		1.5		56.4			—			288.6
Year ended June 30, 2015
Revenues from continuing operations	$	8,815.1	$	2,647.2	$	69.8		$	(593.6	)	$	10,938.5
Earnings from continuing operations before income taxes	2,595.4		301.8		(232.9		)	(593.6		)	2,070.7
Assets from continuing operations	27,507.3		377.7		5,225.5			—			33,110.5
Capital expenditures from continuing operations	94.8		1.3		75.1			—			171.2
Depreciation and amortization	221.2		1.2		55.5			—			277.9

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, 2017
Revenues from continuing operations	$	10,537.4	$	1,086.0	$	291.1	$	465.3	$	12,379.8
Assets from continuing operations	$	32,401.0	$	2,252.3	$	2,018.1	$	508.6	$	37,180.0
Year ended June 30, 2016
Revenues from continuing operations	$	9,870.0	$	1,063.7	$	284.1	$	450.0	$	11,667.8
Assets from continuing operations	$	39,194.2	$	2,064.3	$	1,949.4	$	462.1	$	43,670.0
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