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Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Carrying Value $ 327.7 $ 345.2
Excess carrying value of investment over proportionate share of net assets $ 111.3 116.3
Orbit Private Investments Limited Partners    
Schedule of Investments [Line Items]    
Ownership Percentage 9.80%  
Carrying Value $ 201.9 211.6
Excess carrying value of investment over proportionate share of net assets $ 0.0 0.0
International Financial Data Services L.P.    
Schedule of Investments [Line Items]    
Ownership Percentage 50.00%  
Carrying Value $ 61.4 68.3
Excess carrying value of investment over proportionate share of net assets $ 28.9 31.4
Broadway Square Partners, LLP    
Schedule of Investments [Line Items]    
Ownership Percentage 50.00%  
Carrying Value $ 52.6 53.4
Excess carrying value of investment over proportionate share of net assets $ 28.8 29.5
Pershing Road Development Company, LLC    
Schedule of Investments [Line Items]    
Ownership Percentage 50.00%  
Carrying Value $ 10.0 10.0
Excess carrying value of investment over proportionate share of net assets 53.6 55.4
Other Unconsolidated Affiliates    
Schedule of Investments [Line Items]    
Carrying Value 1.8 1.9
Excess carrying value of investment over proportionate share of net assets $ 0.0 $ 0.0