Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 1.6	$ 17.3	$ 3.9	$ 19.6
Orbit Private Investments L.P.
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	(0.3)	16.2	0.1	17.4
International Financial Data Services L.P.
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	2.2	1.5	4.4	3.0
Pershing Road Development Company, LLC
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	(0.3)	(0.2)	(0.2)	(0.5)
Broadway Square Partners, LLP
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 0.0	$ (0.2)	$ (0.4)	$ (0.3)

- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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