GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Finite-Lived Intangible Assets [Line Items]
Cost	$ 4,940.2	$ 4,937.8
Accumulated Amortization	(2,499.0)	(2,458.4)
Accumulated Impairment	(25.6)	(25.6)
Net	2,415.6	2,453.8
License agreements and collaboration agreements
Finite-Lived Intangible Assets [Line Items]
Cost	3,767.1	3,765.8
Accumulated Amortization	(1,647.5)	(1,614.9)
Accumulated Impairment	(19.6)	(19.6)
Net	2,100.0	2,131.3
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	766.9	766.0
Accumulated Amortization	(573.5)	(568.9)
Accumulated Impairment	(5.5)	(5.5)
Net	187.9	191.6
Trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	318.1	318.2
Accumulated Amortization	(211.2)	(208.4)
Accumulated Impairment	(0.5)	(0.5)
Net	106.4	109.3
Product formulations and technology
Finite-Lived Intangible Assets [Line Items]
Cost	88.1	87.8
Accumulated Amortization	(66.8)	(66.2)
Accumulated Impairment	0.0	0.0
Net	$ 21.3	$ 21.6