Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 24.4	$ 100.0	$ 25.8
Orbit Private Investments LP [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	19.1	96.3	29.3
International Financial Data Services L.P. [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	5.2	3.8	0.3
Pershing Road Development Company, LLC [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	0.1	(0.6)	(5.4)
Broadway Square Partners, LLP [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	(1.1)	(0.4)	1.7
Other Unconsolidated Affiliates [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 1.1	$ 0.9	$ (0.1)