STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Comprehensive Income (Loss)
Change in Net Unrealized Loss on Securities After Adjustment, Tax Expense	$ 71.7	$ 327.6	$ 203.9	$ 110.4
OCI, Liability for Future Policy Benefit, Gain (Loss), after REclassification Adjustment, Tax	(106.0)	(329.3)	(137.7)	35.6
Change in Net Gain on Hedges, Tax Expense (Benefit)	5.9	14.1	1.7	(9.0)
Change in Foreign Currency Translation Adjustment, Tax Expense (Benefit)	0.1	0.0	(0.1)	(1.5)
Change in Unrecognized Pension and Postretirement Benefit costs, Tax Expense	$ (1.4)	$ 0.3	$ (0.7)	$ (9.8)