Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Loss	$ (80.1)	$ (86.3)
Other Comprehensive Loss Before Income Taxes:
Change in Net Unrecognized Postretirement Benefit Costs	(0.5)	(0.1)
Gain on Cash Flow Hedges	0.0	6.1
Change in Discount Rate on Future Life Policyholder Benefits	(109.8)	562.3
Other Comprehensive Income (Loss) Before Income Taxes	76.9	(83.7)
Other Comprehensive Income Tax (Expense) Benefit	(16.7)	17.5
Other Comprehensive Income (Loss), Net of Taxes	60.2	(66.2)
Total Comprehensive Loss	(19.9)	(152.5)
No Credit Losses Recognized in Condensed Consolidated Statements of Loss
Other Comprehensive Loss Before Income Taxes:
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities with:	187.2	(644.6)
Credit Losses Recognized in Condensed Consolidated Statements of Loss
Other Comprehensive Loss Before Income Taxes:
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities with:	$ 0.0	$ (7.4)