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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 ($)	Dec. 31, 2019	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) renewal_term	Jun. 30, 2022 USD ($)	Jan. 31, 2022 EUR (€)	Mar. 31, 2021 USD ($) derivative_instrument	Mar. 31, 2021 EUR (€) derivative_instrument
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Unconsolidated investment				$ 37.0
Future commitment to fund				0.6
Estimate of possible loss				30.0
Derivative asset				66.7	$ 101.4
Other Liabilities
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Other liabilities				14.0
Currency Swap
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Derivative notional amount \| €						€ 880
Derivative asset				$ 66.7
Foreign Exchange Forward \| Itiviti
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Derivative notional amount \| €								€ 1,955
Derivative, number of instruments held \| derivative_instrument							2	2
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
Treasury Lock \| Itiviti \| Forecast
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months			$ 1.1
Information Technology Services Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Number of renewal terms option one \| renewal_term				1
Renewal term option one (in months)				12 months
Remaining commitment amount under agreement				$ 151.2
IBM Private Cloud Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Remaining commitment amount under agreement				154.6
Long-term purchase commitment period		10 years 3 months
A W S Cloud Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Remaining commitment amount under agreement				$ 186.5