Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Additional Information (Details) € in Millions, $ in Millions	1 Months Ended			12 Months Ended
	May 31, 2021 USD ($)	Dec. 31, 2019 term	Mar. 31, 2015	Jun. 30, 2021 USD ($) term	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2021 EUR (€)	Sep. 30, 2020 USD ($)
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Unconsolidated investment				$ 25.3
Fund investee				7.0
Future commitment to fund				2.0
Foreign Exchange Forward | Itiviti
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Derivative notional amount | €							€ 1,955
Pre-tax gain	$ 66.7
Treasury Lock | Itiviti
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Derivative notional amount				1,000.0
Pre-tax loss	$ 11.0
Derivative term	10 years
Cash flow hedge gain (loss) to be reclassified within twelve months	$ 1.1
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				208.9
IBM Private Cloud Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Remaining commitment amount under agreement				207.0
Long-term purchase commitment period		10 years 3 months
Assets held-for-sale					$ 18.0			$ 18.0
Total expenses				$ 176.7	$ 118.7	$ 106.1
Amended EU IT 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				$ 30.8
Number of renewal terms option two | term				1
Renewal term option two (in months)				24 months