CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 358.3	$ 240.4
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain (Loss) on Securities (net of tax expense (benefit) of $219.6; $(775.1))	823.2	(2,893.8)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense (benefit) of $(152.9); $982.8)	(573.9)	3,658.1	[1]
Change in Net Gain (Loss) on Hedges (net of tax expense (benefit) of $4.7; $(2.9))	17.4	(10.4)
Change in Foreign Currency Translation Adjustment (net of tax expense (benefit) of $(0.2); $0.9)	24.7	(32.0)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $(1.6); $0.9)	5.4	(4.2)
Total Other Comprehensive Income	286.0	726.1
Comprehensive Loss	$ 644.3	$ 966.5

[1] 1 Previously disclosed as Benefits and Change in Reserves for Future Benefits