Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Additional Information (Details) $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2019 term	Mar. 31, 2015	Jun. 30, 2020 USD ($) term	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Future capital commitment			$ 3.5
Amended IT Services Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Agreement extension term, period		2 years
Number of renewal terms option one | term	1
Renewal term option one (in months)	12 months
Remaining commitment amount under agreement			251.7
IBM Private Cloud Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Remaining commitment amount under agreement			$ 236.7
Long-term purchase commitment period			10 years 3 months
Non-cash pre-tax charge on write down			$ 30.4
Assets held-for-sale			18.0
Total expenses			$ 118.7	$ 106.1	$ 107.5
EU Information Technology Services Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Number of renewal terms option one | term			1
Renewal term option one (in months)			12 months
Remaining commitment amount under agreement			$ 23.9
Number of renewal terms option two | term			1
Renewal term option two (in months)			24 months