Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Carrying Value	$ 346.7	$ 345.2
Excess carrying value of investment over proportionate share of net assets	$ 114.7	116.3
Orbit Private Investments Limited Partners
Schedule of Investments [Line Items]
Ownership Percentage	9.80%
Carrying Value	$ 212.9	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	$ 68.9	68.3
Excess carrying value of investment over proportionate share of net assets	$ 30.6	31.4
Pershing Road Development Company, LLC
Schedule of Investments [Line Items]
Ownership Percentage	50.00%
Carrying Value	$ 9.9	10.0
Excess carrying value of investment over proportionate share of net assets	$ 54.8	55.4
Broadway Square Partners, LLP
Schedule of Investments [Line Items]
Ownership Percentage	50.00%
Carrying Value	$ 53.1	53.4
Excess carrying value of investment over proportionate share of net assets	29.3	29.5
Other Unconsolidated Affiliates
Schedule of Investments [Line Items]
Carrying Value	1.9	1.9
Excess carrying value of investment over proportionate share of net assets	$ 0.0	$ 0.0

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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