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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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