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SHAREHOLDERS' EQUITY - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Equity [Abstract]
Net unrealized losses on investments having no allowance for credit losses	$ (1,281.6)	$ (1,235.2)
Unrealized losses on investments with an allowance for credit losses	(1,108.7)	(931.0)
Change in discount rates for liability for future policy benefits	624.5	133.4
Change in instrument-specific credit risk for market risk benefits	1.4	4.8
Deferred income tax assets	393.0	451.2
Accumulated other comprehensive loss	$ (1,371.4)	$ (1,576.8)

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- Definition

Accumulated Other Comprehensive Income (Loss), Changed in instrument Specific Credit Risk For Market Risk Benefits

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- Definition

Accumulated Other Comprehensive Income (Loss), Changes in Discount Rate for Liability for Future Policy Benefit

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- Definition

Accumulated Other Comprehensive Income (Loss), Deferred Income Tax Liabilities

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- Definition

Accumulated Other Comprehensive Income (Loss), Net Unrealized Appreciation On Investments Having No Allowance For Credit Losses

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Accumulated Other Comprehensive Income (Loss), Net Unrealized Appreciation On Investments With Allowance For Credit Losses

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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