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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Equity Method Investments [Line Items] |  |
Investment, Type [Extensible Enumeration] | Certificates of Deposit [Member] | Certificates of Deposit [Member]
Held to maturity | $ 25.4 | $ 23.3
Total | 2,588.7 | 2,554.7
U.S. Treasury note |  |
Schedule of Equity Method Investments [Line Items] |  |
Held to maturity | 1.0 | 1.0
Discretionary investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 259.9 | 246.4
Equity method investments | 0.0 | 5.3
Seed capital |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 237.7 | 247.8
Equity method investments | 96.3 | 91.1
Supplemental savings plan liability economic hedges |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 837.4 | 806.6
Equity method investments | 24.5 | 21.0
Investment partnerships and other investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 67.7 | 69.7
Investments in affiliated collateralized loan obligations |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 7.9 | 8.4
Held to maturity | $ 88.9 | $ 94.1
23% Investment in UTI Asset Management Company Limited (India) |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment (ownership percentage) | 23.00% | 23.00%
Equity method investments | $ 171.5 | $ 164.5
Investments in affiliated private investment funds - carried interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 514.3 | 519.9
Investments in affiliated private investment funds - seed/co-investment |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 254.5 | 253.4
Investment Partnerships And Other Investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 1.7 | $ 2.2

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- Definition Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480524/946-210-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column C)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 + Details
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