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Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates (Detail) - USD ($) $ in Millions		Dec. 31, 2025		Dec. 31, 2024
Schedule of Investments [Line Items]
Carrying Value		$ 307.7		$ 328.4
Excess carrying value of investment over proportionate share of net assets		$ 103.0		$ 109.6
Orbit Private Investments L.P.
Schedule of Investments [Line Items]
Ownership Percentage		9.80%	[1]	9.80%
Carrying Value		$ 202.9		$ 203.9
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	[1]	50.00%
Carrying Value		$ 41.4		60.2
Excess carrying value of investment over proportionate share of net assets		$ 24.6		$ 28.0
Broadway Square Partners, LLP
Schedule of Investments [Line Items]
Ownership Percentage		50.00%	[1]	50.00%
Carrying Value		$ 51.2		$ 52.2
Excess carrying value of investment over proportionate share of net assets		$ 27.8		28.6
Pershing Road Development Company, LLC
Schedule of Investments [Line Items]
Ownership Percentage	[1]	50.00%
Carrying Value		$ 10.3		10.1
Excess carrying value of investment over proportionate share of net assets		50.6		53.0
Other Unconsolidated Affiliates
Schedule of Investments [Line Items]
Carrying Value		1.9		2.0
Excess carrying value of investment over proportionate share of net assets		$ 0.0		$ 0.0
[1] Ownership percentage is as of December 31, 2025 and December 31, 2024.

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