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Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated affiliates, net $ (9.3) $ 24.4 $ 100.0
Orbit Private Investments L.P.      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated affiliates, net 10.6 19.1 96.3
International Financial Data Services L.P.      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated affiliates, net 2.5 5.2 3.8
Pershing Road Development Company, LLC      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated affiliates, net 0.1 0.1 (0.6)
Broadway Square Partners, LLP      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated affiliates, net (1.0) (1.1) (0.4)
Other Unconsolidated Affiliates      
Schedule of Investments [Line Items]      
Equity in earnings of unconsolidated affiliates, net $ (0.3) $ 1.1 $ 0.9