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Unconsolidated Affiliates - Schedule of Equity in Earnings of Unconsolidated Affiliates (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Investments [Line Items]        
Equity in earnings of unconsolidated affiliates, net $ 1.1 $ 27.5 $ 20.7 $ 42.6
Orbit Private Investments L.P.        
Schedule of Investments [Line Items]        
Equity in earnings of unconsolidated affiliates, net (0.3) 26.4 17.1 38.8
International Financial Data Services L.P.        
Schedule of Investments [Line Items]        
Equity in earnings of unconsolidated affiliates, net 1.3 1.1 4.3 3.6
Pershing Road Development Company, LLC        
Schedule of Investments [Line Items]        
Equity in earnings of unconsolidated affiliates, net 0.2 0.2 (0.1) (0.7)
Broadway Square Partners, LLP        
Schedule of Investments [Line Items]        
Equity in earnings of unconsolidated affiliates, net (0.2) 0.0 (0.7) 0.0
Other Unconsolidated Affiliates        
Schedule of Investments [Line Items]        
Equity in earnings of unconsolidated affiliates, net $ 0.1 $ (0.2) $ 0.1 $ 0.9