EMPLOYEE BENEFIT PLANS - Reconciliation of the Projected Benefit Obligations, Plan Assets, Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Change in benefit obligation
Benefit obligation—July 1	$ 825.4	$ 865.6
Service cost	19.4	34.2	$ 34.5
Interest cost	10.2	11.4	15.6
Plan participants’ contributions	4.5	6.4
Benefits paid	(19.1)	(20.3)
New employees transfers in	29.7	18.7
Premiums paid	(1.3)	(2.3)
Pension curtailment	(6.6)	(12.0)
Acquisitions/Divestitures	(304.0)	0.0
Pension settlement	(47.0)	(39.0)
Actuarial loss (gain)	33.1	(33.2)
Effect of exchange rates	40.7	(4.1)
Benefit obligation—June 30	585.0	825.4	865.6
Change in plan assets
Fair value of plan assets—July 1	274.6	268.9
Actual return on plan assets	24.6	3.4
Employer contributions	28.5	36.4
Plan participants’ contributions	4.5	6.4
Benefits paid	(19.1)	(19.9)
New employees transfers in	29.7	18.7
Premiums paid	(1.3)	(2.2)
Plan settlements	(46.5)	(39.0)
Acquisitions/Divestitures	(149.0)	0.0
Effect of exchange rates	13.1	1.9
Fair value of plan assets—June 30	159.1	274.6	268.9
Reclassification of net obligation to held for sale liabilities	0.0	140.8
Funded status	(425.9)	(410.0)
Pension Plans
Change in benefit obligation
Actuarial loss (gain)	35.9
Other Post-Employment Benefits
Change in benefit obligation
Benefit obligation—July 1	53.7	57.8
Service cost	1.0	1.1	1.2
Interest cost	1.3	1.7	2.1
Plan participants’ contributions	0.2	0.3
Benefits paid	(2.3)	(2.1)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Pension curtailment	0.0	(0.8)
Acquisitions/Divestitures	(0.6)	0.0
Pension settlement	0.0	0.0
Actuarial loss (gain)	(2.8)	(4.2)
Effect of exchange rates	(0.3)	(0.1)
Benefit obligation—June 30	50.2	53.7	57.8
Change in plan assets
Fair value of plan assets—July 1	0.5	0.4
Actual return on plan assets	0.0	0.0
Employer contributions	2.0	1.9
Plan participants’ contributions	0.2	0.3
Benefits paid	(2.3)	(2.1)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Plan settlements	0.0	0.0
Acquisitions/Divestitures	(0.4)	0.0
Effect of exchange rates	0.0	0.0
Fair value of plan assets—June 30	0.0	0.5	0.4
Reclassification of net obligation to held for sale liabilities	0.0	0.0
Funded status	(50.2)	(53.2)
United States | Pension Plans
Change in benefit obligation
Benefit obligation—July 1	18.5	17.7
Service cost	0.0	0.0	0.0
Interest cost	0.5	0.6	0.7
Plan participants’ contributions	0.0	0.0
Benefits paid	(0.6)	(1.4)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Pension curtailment	0.0	0.0
Acquisitions/Divestitures	0.0	0.0
Pension settlement	0.0	0.0
Actuarial loss (gain)	0.5	1.6
Effect of exchange rates	0.0	0.0
Benefit obligation—June 30	18.9	18.5	17.7
Change in plan assets
Fair value of plan assets—July 1	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.6	1.3
Plan participants’ contributions	0.0	0.0
Benefits paid	(0.6)	(1.3)
New employees transfers in	0.0	0.0
Premiums paid	0.0	0.0
Plan settlements	0.0	0.0
Acquisitions/Divestitures	0.0	0.0
Effect of exchange rates	0.0	0.0
Fair value of plan assets—June 30	0.0	0.0	0.0
Reclassification of net obligation to held for sale liabilities	0.0	0.0
Funded status	(18.9)	(18.5)
International | Pension Plans
Change in benefit obligation
Benefit obligation—July 1	753.2	790.1
Service cost	18.4	33.1	33.3
Interest cost	8.4	9.1	12.8
Plan participants’ contributions	4.3	6.1
Benefits paid	(16.2)	(16.8)
New employees transfers in	29.7	18.7
Premiums paid	(1.3)	(2.3)
Pension curtailment	(6.6)	(11.2)
Acquisitions/Divestitures	(303.4)	0.0
Pension settlement	(47.0)	(39.0)
Actuarial loss (gain)	35.4	(30.6)
Effect of exchange rates	41.0	(4.0)
Benefit obligation—June 30	515.9	753.2	790.1
Change in plan assets
Fair value of plan assets—July 1	274.1	268.5
Actual return on plan assets	24.6	3.4
Employer contributions	25.9	33.2
Plan participants’ contributions	4.3	6.1
Benefits paid	(16.2)	(16.5)
New employees transfers in	29.7	18.7
Premiums paid	(1.3)	(2.2)
Plan settlements	(46.5)	(39.0)
Acquisitions/Divestitures	(148.6)	0.0
Effect of exchange rates	13.1	1.9
Fair value of plan assets—June 30	159.1	274.1	$ 268.5
Reclassification of net obligation to held for sale liabilities	0.0	140.8
Funded status	$ (356.8)	$ (338.3)