Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 100.0	$ 25.8	$ 25.4
Orbit Private Investments LP [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	96.3	29.3	0.0
International Financial Data Services L.P. [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	3.8	0.3	1.6
Pershing Road Development Company, LLC [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	(0.6)	(5.4)	(1.1)
Broadway Square Partners, LLP [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	(0.4)	1.7	1.8
Other Unconsolidated Affiliates [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 0.9	$ (0.1)	$ 23.1