Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Data Center Agreements - Amortization Expense of Capitalized Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Loss Contingencies [Line Items]
Amortization of capitalized costs	$ 4.5	$ 6.1	$ 5.8
Amended IT Services Agreement
Loss Contingencies [Line Items]
Amortization of capitalized costs	3.2	4.2	5.3
Amended EU IT Services Agreement
Loss Contingencies [Line Items]
Amortization of capitalized costs	$ 1.2	$ 1.8	$ 0.5