EQUITY AND CONVERTIBLE PREFERRED STOCK - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 3,997.4	$ 3,345.8	$ 3,062.2
Total other comprehensive (loss) income, net of tax	(132.7)	55.9	(396.9)
Ending balance	4,011.7	3,997.4	3,345.8
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(662.4)	(717.9)	(321.9)
Other comprehensive income (loss) before reclassifications	(127.6)	65.4
Net amounts reclassified from AOCI/(L)	(5.1)	(9.9)
Total other comprehensive (loss) income, net of tax	(132.7)	55.5
Ending balance	(795.1)	(662.4)	(717.9)
(Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0.7	4.3
Other comprehensive income (loss) before reclassifications	1.2	1.7
Net amounts reclassified from AOCI/(L)	0.2	(5.3)
Total other comprehensive (loss) income, net of tax	1.4	(3.6)
Ending balance	2.1	0.7	4.3
(Losses) Gains on Net Investment Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(49.8)	4.1
Other comprehensive income (loss) before reclassifications	26.8	(53.9)
Net amounts reclassified from AOCI/(L)	0.0	0.0
Total other comprehensive (loss) income, net of tax	26.8	(53.9)
Ending balance	(23.0)	(49.8)	4.1
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(667.9)	(770.8)
Other comprehensive income (loss) before reclassifications	(155.1)	102.9
Net amounts reclassified from AOCI/(L)	0.0	0.0
Total other comprehensive (loss) income, net of tax	(155.1)	102.9
Ending balance	(823.0)	(667.9)	(770.8)
Pension and Other Post-Employment Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	54.6	44.5
Other comprehensive income (loss) before reclassifications	(0.5)	14.7
Net amounts reclassified from AOCI/(L)	(5.3)	(4.6)
Total other comprehensive (loss) income, net of tax	(5.8)	10.1
Ending balance	48.8	54.6	$ 44.5
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net amounts reclassified from AOCI/(L)	7.1	6.1
Amortization of actuarial gains (losses), tax	$ 1.8	$ 1.5