CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Net premiums and contract charges earned	$ 1,029.0	$ 889.6	$ 930.7
Net investment income	400.9	422.5	357.6
Net investment losses	(56.5)	(11.0)	(2.3)
Other income	9.5	29.0	24.4
Total revenues	1,382.9	1,330.1	1,310.4
Benefits, losses and expenses
Benefits, claims and settlement expenses	761.6	617.7	568.9
Interest credited	177.6	164.4	204.6
Operating expenses	315.9	251.5	237.8
DAC unlocking and amortization expense	98.7	94.7	99.9
Intangible asset amortization expense	16.8	13.0	14.4
Interest expense	19.4	13.9	15.2
Other expense - goodwill and intangible asset impairments	4.8	0.0	10.0
Total benefits, losses and expenses	1,394.8	1,155.2	1,150.8
Income (loss) before income taxes	(11.9)	174.9	159.6
Income tax expense (benefit)	(9.3)	32.1	26.3
Net income (loss)	$ (2.6)	$ 142.8	$ 133.3
Net income (loss) per share
Net income per share - basic (in usd per share)	$ (0.06)	$ 3.40	$ 3.18
Diluted (in usd per share)	$ (0.06)	$ 3.39	$ 3.17
Weighted average number of shares and equivalent shares
Basic (in shares)	41,600,000	42,000,000.0	41,900,000
Diluted (in shares)	41,800,000	42,200,000	42,000,000.0
Net income (loss)	$ (2.6)	$ 142.8	$ 133.3
Other comprehensive income (loss), net of tax:
Change in net unrealized investment gains (losses) on fixed maturity securities	(647.6)	(75.6)	135.9
Change in net funded status of benefit plans	(1.4)	(1.0)	0.4
Other comprehensive income (loss)	(646.2)	(74.6)	135.5
Total comprehensive income (loss)	$ (648.8)	$ 68.2	$ 268.8