Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ 2.3	$ 2.3
Orbit Private Investments L.P.
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	0.4	1.2
International Financial Data Services L.P.
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	2.2	1.5
Pershing Road Development Company, LLC
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	0.1	(0.1)
Broadway Square Partners, LLP
Schedule of Investments [Line Items]
Equity in earnings of unconsolidated affiliates, net	$ (0.4)	$ (0.3)

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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