GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Schedule of Goodwill (Details) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Goodwill [Roll Forward]
Gross beginning balance	$ 8,014,000,000	$ 8,101,900,000
Accumulated impairments	(4,040,100,000)	(4,040,100,000)	$ (3,935,100,000)
Net beginning balance	3,973,900,000	4,166,800,000
Acquisitions		128,600,000
Dispositions		(22,900,000)
Impairment charges	0	(105,000,000.0)	(3,307,500,000)
Measurement period adjustments	0
Foreign currency translation	144,200,000	(193,600,000)
Gross ending balance	8,158,200,000	8,014,000,000	8,101,900,000
Accumulated impairments	(4,040,100,000)	(4,040,100,000)	(3,935,100,000)
Net ending balance	4,118,100,000	3,973,900,000	4,166,800,000
Americas
Goodwill [Roll Forward]
Gross beginning balance	3,112,200,000	3,069,400,000
Accumulated impairments	(1,768,700,000)	(1,768,700,000)	(1,768,700,000)
Net beginning balance	1,343,500,000	1,300,700,000
Acquisitions		128,600,000
Dispositions		(10,800,000)
Impairment charges		0
Measurement period adjustments	(62,000,000.0)
Foreign currency translation	46,600,000	(75,000,000.0)
Gross ending balance	3,096,800,000	3,112,200,000	3,069,400,000
Accumulated impairments	(1,768,700,000)	(1,768,700,000)	(1,768,700,000)
Net ending balance	1,328,100,000	1,343,500,000	1,300,700,000
EMEA
Goodwill [Roll Forward]
Gross beginning balance	3,638,900,000	3,737,900,000
Accumulated impairments	(1,857,300,000)	(1,857,300,000)	(1,752,300,000)
Net beginning balance	1,781,600,000	1,985,600,000
Acquisitions		0
Dispositions		(10,100,000)
Impairment charges		(105,000,000.0)
Measurement period adjustments	35,900,000
Foreign currency translation	68,200,000	(88,900,000)
Gross ending balance	3,743,000,000	3,638,900,000	3,737,900,000
Accumulated impairments	(1,857,300,000)	(1,857,300,000)	(1,752,300,000)
Net ending balance	1,885,700,000	1,781,600,000	1,985,600,000
Asia Pacific
Goodwill [Roll Forward]
Gross beginning balance	1,262,900,000	1,294,600,000
Accumulated impairments	(414,100,000)	(414,100,000)	(414,100,000)
Net beginning balance	848,800,000	880,500,000
Acquisitions		0
Dispositions		(2,000,000.0)
Impairment charges		0
Measurement period adjustments	26,100,000
Foreign currency translation	29,400,000	(29,700,000)
Gross ending balance	1,318,400,000	1,262,900,000	1,294,600,000
Accumulated impairments	(414,100,000)	(414,100,000)	(414,100,000)
Net ending balance	$ 904,300,000	$ 848,800,000	$ 880,500,000