Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Data Center Agreements - Capitalized Costs (Details) $ in Millions	12 Months Ended
	Jun. 30, 2023 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	0.0
Total capitalized costs, ending balance	70.7
Total accumulated amortization	(55.7)
Net Deferred Costs	15.0
Amended 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	(49.9)
Net Deferred Costs	13.1
Other
Capitalized Contract Cost [Roll Forward]
Capitalized costs, beginning balance	7.6
Capitalized costs incurred	0.0
Impact of foreign currency exchange	0.0
Total capitalized costs, ending balance	7.7
Total accumulated amortization	(5.8)
Net Deferred Costs	$ 1.9