CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investments
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,652.9; 2022, $5,756.9)	$ 5,235.3	$ 5,185.0	[1]
Equity securities at fair value, (cost $86.2 and $99.6)	86.2	99.6	[1]
Limited partnership interests	1,138.8	983.7	[1]
Policy loans	141.4	139.3	[1]
Short-term and other investments	228.8	180.0	[1]
Total investments	6,830.5	6,587.6	[1]
Cash	29.7	42.8	[1],[2]
Deferred policy acquisition costs	336.3	330.6	[1]
Reinsurance balances receivable	480.5	468.0	[1]
Deposit asset on reinsurance	2,496.6	2,516.6	[1]
Intangible assets	170.3	185.2	[1]
Goodwill	54.3	54.3	[1]
Other assets	357.6	328.7	[1]
Separate Account variable annuity assets	3,294.1	2,792.3	[1]
Total assets	14,049.9	13,306.1	[1]
Policy liabilities
Future policy benefit reserves	1,761.8	1,718.0	[1]
Policyholders' account balances	5,187.0	5,260.6	[1]
Unpaid claims and claim expenses	581.7	564.0	[1]
Unearned premiums	300.9	266.1	[1]
Total policy liabilities	7,831.4	7,808.7	[1]
Other policyholder funds	916.0	809.3	[1]
Other liabilities	287.1	299.5	[1]
Short-term debt	0.0	249.0	[1]
Long-term debt	546.0	249.0	[1]
Separate Account variable annuity liabilities	3,294.1	2,792.3	[1]
Total liabilities	12,874.6	12,207.8	[1]
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued	0.0	0.0	[1]
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2023, 66,747,821; 2022, 66,618,465	0.1	0.1	[1]
Additional paid-in capital	510.9	502.6	[1]
Retained earnings	1,502.2	1,512.4	[1]
Accumulated other comprehensive income (loss), net of tax:
Net unrealized investment losses on fixed maturity securities	(328.3)	(449.6)	[1]
Net reserve remeasurements attributable to discount rates	21.9	59.0	[1]
Net funded status of benefit plans	(7.6)	(8.8)	[1]
Treasury stock, at cost, 2023, 25,911,087 shares; 2022, 25,714,153 shares	(523.9)	(517.4)	[1]
Total shareholders' equity	1,175.3	1,098.3	[3]
Total liabilities and shareholders' equity	$ 14,049.9	$ 13,306.1	[1]

[1] Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

[2] Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

[3] Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements