CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Insurance policy income	$ 2,300.2	$ 2,341.8	$ 2,331.0
Net investment income	1,154.5	1,073.1	1,097.4
Fee revenue and other income	149.2	142.5	123.5
Insurance policy benefits	(1,635.8)	(1,661.1)	(1,582.9)
Interest expense	(120.9)	(92.8)	(111.2)
Deferrable policy acquisition costs	(332.2)	(298.8)	(275.8)
Other operating costs	(985.7)	(926.2)	(818.1)
Income taxes	(33.9)	19.8	(28.4)
Net cash from operating activities	495.4	598.3	735.5
Cash flows from investing activities:
Sales of investments	3,253.6	1,823.6	1,480.0
Maturities and redemptions of investments	1,550.7	2,880.3	2,218.3
Purchases of investments	(6,482.0)	(6,135.2)	(4,280.7)
Net sales (purchases) of trading securities	(42.4)	(19.5)	13.8
Other	(61.2)	(75.3)	(39.8)
Net cash used by investing activities	(1,781.3)	(1,526.1)	(608.4)
Cash flows from financing activities:
Issuance of notes payable, net	0.0	0.0	145.8
Issuance of common stock	13.5	21.5	19.0
Payments to repurchase common stock	(190.1)	(407.8)	(268.3)
Common stock dividends paid	(64.8)	(65.7)	(67.0)
Amounts received for deposit products	3,022.6	2,405.1	1,620.1
Withdrawals from deposit products	(1,461.4)	(1,352.5)	(1,235.6)
Issuance of investment borrowings:
Federal Home Loan Bank	285.0	795.8	498.0
Payments on investment borrowings:
Federal Home Loan Bank	(361.3)	(722.4)	(499.8)
Related to variable interest entities and other	(44.4)	(5.4)	(2.1)
Debt issuance costs	0.0	(1.0)	0.0
Net cash provided by financing activities	1,199.1	667.6	210.1
Net increase (decrease) in cash and cash equivalents	(86.8)	(260.2)	337.2
Cash and cash equivalents - unrestricted and held by variable interest entities, beginning of year	731.7	991.9	654.7
Cash and cash equivalents - unrestricted and held by variable interest entities, end of year	$ 644.9	$ 731.7	$ 991.9