Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Carrying Value	$ 257.7	$ 266.9
Excess carrying value of investment over proportionate share of net assets	$ 121.3	123.0
International Financial Data Services L.P. [Member]
Schedule of Investments [Line Items]
Ownership Percentage	50.00%
Carrying Value	$ 71.2	85.1
Excess carrying value of investment over proportionate share of net assets	$ 33.9	34.8
Orbit Private Investments Limited Partners [Member]
Schedule of Investments [Line Items]
Ownership Percentage	9.80%
Carrying Value	$ 120.2	115.3
Excess carrying value of investment over proportionate share of net assets	$ 0.0	0.0
Pershing Road Development Company, LLC [Member]
Schedule of Investments [Line Items]
Ownership Percentage	50.00%
Carrying Value	$ 10.5	10.6
Excess carrying value of investment over proportionate share of net assets	$ 57.3	57.9
Broadway Square Partners, LLP [Member]
Schedule of Investments [Line Items]
Ownership Percentage	50.00%
Carrying Value	$ 53.8	53.8
Excess carrying value of investment over proportionate share of net assets	30.1	30.3
Other Unconsolidated Affiliates [Member]
Schedule of Investments [Line Items]
Carrying Value	2.0	2.1
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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(10))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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