CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues
Net premiums and contract charges earned	$ 1,228.4	$ 1,146.0	$ 1,057.1
Net investment income	464.3	445.7	444.8
Net investment (losses)	(13.0)	(17.3)	(24.0)
Other income	21.7	20.8	14.0
Total revenues	1,701.4	1,595.2	1,491.9
Benefits, losses and expenses
Benefits, claims and settlement expenses (Reserve remeasurement (gains)/losses $6.0, $1.6, $(1.6))	711.5	745.0	769.1
Interest credited	216.9	215.9	205.7
Operating expenses	396.6	345.5	318.1
DAC amortization expense	124.5	111.1	101.2
Intangible asset amortization expense	14.3	14.5	14.8
Interest expense	36.4	34.6	29.7
Total benefits, losses and expenses	1,500.2	1,466.6	1,438.6
Income before income taxes	201.2	128.6	53.3
Income tax expense	39.1	25.8	8.3
Net income	$ 162.1	$ 102.8	$ 45.0
Net income per share
Basic (in usd per share)	$ 3.93	$ 2.49	$ 1.09
Diluted (in usd per share)	$ 3.90	$ 2.48	$ 1.09
Weighted average number of shares and equivalent shares
Basic (in shares)	41.2	41.3	41.3
Diluted (in shares)	41.6	41.5	41.4
Net income	$ 162.1	$ 102.8	$ 45.0
Other comprehensive income (loss), net of tax:
Change in net unrealized investment gains (losses) on fixed maturity securities	111.9	(29.1)	121.3
Change in net reserve remeasurements attributable to discount rates	(17.5)	89.0	(37.1)
Change in net funded status of benefit plans	4.5	0.6	1.2
Other comprehensive income	98.9	60.5	85.4
Comprehensive income	$ 261.0	$ 163.3	$ 130.4