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Investments, Fixed Maturity, Carrying Value, Non-Income Producing

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Number of Mortgage Loans in Process of Foreclosure

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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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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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended
INVESTMENTS - NARRATIVE (Details) $ in Millions	Mar. 31, 2025 USD ($)	Mar. 31, 2025 USD ($) mortgage_loan	Mar. 31, 2025 USD ($) loan	Mar. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized cost of fixed maturities that were non-income producing	$ 5.7	$ 5.7	$ 5.7
Carrying value of fixed maturities that were non-income producing	4.2	$ 4.2	$ 4.2
Value of available for sale securities sold	230.3			$ 197.1
Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent		0	26
Total Fixed Maturities, Available For Sale
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale	2.8			5.9
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale				1.1
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale				3.5
Various Other Investments
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale				$ 1.3
Amortized Cost \| Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,081.5	$ 1,081.5	$ 1,081.5
Fair Value \| Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,091.2	$ 1,091.2	1,091.2
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans in process of foreclosure \| mortgage_loan		0
Amortized cost	1,539.7	$ 1,539.7	1,539.7
Commercial Portfolio Segment \| Amortized Cost \| Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,539.8	1,539.8	1,539.8
Commercial Portfolio Segment \| Fair Value \| Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,417.9	1,417.9	1,417.9
Residential Portfolio Segment \| Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Amortized cost	20.2	20.2	$ 20.2
Residential Portfolio Segment \| Foreclosure \| Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent \| loan			9
Amortized cost	$ 4.9	$ 4.9	$ 4.9