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SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Equity [Abstract]
Net unrealized losses on investments having no allowance for credit losses	$ (836.1)	$ (1,281.6)
Unrealized losses on investments with an allowance for credit losses	(1,308.5)	(1,108.7)
Change in discount rates for liability for future policy benefits	529.4	624.5
Change in instrument-specific credit risk for market risk benefits	2.0	1.4
Deferred income tax assets	360.5	393.0
Accumulated other comprehensive loss	$ (1,252.7)	$ (1,371.4)

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- Definition

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

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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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- Definition

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

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- Definition

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
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