EQUITY AND CONVERTIBLE PREFERRED STOCK - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 3,228.8	$ 4,593.4	$ 8,855.2
Total other comprehensive income (loss), net of tax	134.2	(397.3)	(217.5)
Ending balance	3,062.2	3,228.8	4,593.4
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(456.2)	(58.8)	158.8
Other comprehensive income before reclassifications	106.8	(397.9)
Less: Net amounts reclassified from AOCI/(L)	27.5	0.5
Total other comprehensive income (loss), net of tax	134.3	(397.4)	(217.6)
Ending balance	(321.9)	(456.2)	(58.8)
(Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(43.0)	(13.3)
Other comprehensive income before reclassifications	0.6	(37.5)
Less: Net amounts reclassified from AOCI/(L)	26.9	7.8
Total other comprehensive income (loss), net of tax	27.5	(29.7)
Ending balance	(15.5)	(43.0)	(13.3)
(Losses) Gains on Net Investment Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	261.9	214.8
Other comprehensive income before reclassifications	(294.1)	47.1
Less: Net amounts reclassified from AOCI/(L)	0.0	0.0
Total other comprehensive income (loss), net of tax	(294.1)	47.1
Ending balance	(32.2)	261.9	214.8
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(683.8)	(257.4)
Other comprehensive income before reclassifications	424.5	(426.4)
Less: Net amounts reclassified from AOCI/(L)	0.0	0.0
Total other comprehensive income (loss), net of tax	424.5	(426.4)
Ending balance	(259.3)	(683.8)	(257.4)
Pension and Other Post-Employment Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	8.7	(2.9)
Other comprehensive income before reclassifications	(24.2)	18.9
Less: Net amounts reclassified from AOCI/(L)	0.6	(7.3)
Total other comprehensive income (loss), net of tax	(23.6)	11.6
Ending balance	(14.9)	8.7	$ (2.9)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Less: Net amounts reclassified from AOCI/(L)	0.9	10.5
Amortization of actuarial gains (losses), tax	$ 0.3	$ 3.2