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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 13.7	$ 112.3
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on investments	229.4	(114.6)
Adjustment to discount rate for liability for future policy benefits	(68.8)	231.7
Adjustment to instrument-specific credit risk for market risk benefits	1.7	(1.4)
Reclassification adjustments:
For net realized investment losses included in net income	7.1	7.3
Other comprehensive income (loss) before tax	169.4	123.0
Income tax (expense) benefit related to items of accumulated other comprehensive income (loss)	(37.1)	(26.5)
Other comprehensive income (loss), net of tax	132.3	96.5
Comprehensive income (loss)	$ 146.0	$ 208.8

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