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INVESTMENTS IN VARIABLE INTEREST ENTITIES - CHANGES IN ALLOWANCE (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance at the beginning of the period | $ 37.1 | $ 42.9
Additions for securities for which credit losses were not previously recorded | 2.5 | 2.2
Additions (reductions) for securities where an allowance was previously recorded | 0.6 | (6.0)
Reduction for securities disposed during the period | (1.3) | (0.1)
Allowance at the end of the period | 38.9 | 39.0
Corporate securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance at the beginning of the period | 31.1 | 41.7
Additions for securities for which credit losses were not previously recorded | 2.5 | 2.2
Additions (reductions) for securities where an allowance was previously recorded | 0.8 | (6.1)
Reduction for securities disposed during the period | (1.3) | (0.1)
Allowance at the end of the period | 33.1 | 37.7
Variable Interest Entity, Primary Beneficiary | Corporate securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Allowance at the beginning of the period | 1.3 | 3.1
Additions for securities for which credit losses were not previously recorded | 0.9 | 0.3
Additions (reductions) for securities where an allowance was previously recorded | 0.8 | 1.7
Reduction for securities disposed during the period | (0.5) | (0.8)
Allowance at the end of the period | $ 2.5 | $ 4.3

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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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