CONTRACTUAL COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ARRANGEMENTS - Data Center Agreements - Capitalized Costs (Details) $ in Millions	12 Months Ended
	Jun. 30, 2025 USD ($)
Data Center Agreements
Capitalized Contract Cost [Roll Forward]
Capitalized costs, beginning balance	$ 70.7
Capitalized costs incurred	0.0
Impact of foreign currency exchange	0.5
Total capitalized costs, ending balance	71.2
Total accumulated amortization	(63.2)
Net Deferred Costs	7.9
Amended and Restated IT Services Agreement
Capitalized Contract Cost [Roll Forward]
Capitalized costs, beginning balance	63.0
Capitalized costs incurred	0.0
Impact of foreign currency exchange	0.0
Total capitalized costs, ending balance	63.0
Total accumulated amortization	(56.5)
Net Deferred Costs	6.5
Other
Capitalized Contract Cost [Roll Forward]
Capitalized costs, beginning balance	7.7
Capitalized costs incurred	0.0
Impact of foreign currency exchange	0.5
Total capitalized costs, ending balance	8.1
Total accumulated amortization	(6.7)
Net Deferred Costs	$ 1.4