STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Change in Net Unrealized Gain on Securities After Adjustment, Tax Expense (Benefit)	$ (313.8)	$ (520.8)	$ (249.2)	$ (2,017.2)
OCI, Liability for Future Policy Benefit, Gain (Loss), after REclassification Adjustment, Tax	445.0	599.4	368.2	2,485.7
Change in Net Gain on Hedges, Tax Benefit	(38.9)	(8.1)	(44.7)	(12.6)
Change in Foreign Currency Translation Adjustment, Tax Expense	0.7	(5.4)	(0.3)	(11.5)
Change in Unrecognized Pension and Postretirement Benefit costs, Tax Expense	$ (1.2)	$ (1.1)	$ (1.1)	$ (4.0)