Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 5.7	$ 1.3
Orbit Private Investments LP [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	4.8	0.0
International Financial Data Services L.P. [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	1.1	0.5
Pershing Road Development Company, LLC [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	(0.2)	0.3
Broadway Square Partners, LLP [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	0.1	0.5
Other Unconsolidated Affiliates [Member]
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ (0.1)	$ 0.0