CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows - operating activities
Net income	$ 162.1	$ 102.8	$ 45.0
Adjustments to reconcile net income to net cash provided by operating activities:
Net investment losses	13.0	17.3	24.0
Depreciation and intangible asset amortization	27.1	26.4	26.2
Share-based compensation expense	10.2	9.9	9.5
Loss (gain) from equity method investments, net of dividends or distributions	(5.0)	35.5	(14.5)
Changes in:
Insurance liabilities	125.3	82.8	186.7
Amounts due under reinsurance agreements	5.8	55.7	(12.5)
Income tax liabilities	2.1	28.2	(15.0)
Other operating assets and liabilities	219.1	101.4	53.9
Contributions to defined benefit plan	(3.8)	(1.4)	0.0
Other, net	(2.7)	(6.5)	(1.2)
Net cash provided by operating activities	553.2	452.1	302.1
Cash flows - investing activities
Fixed maturity securities purchases	(1,347.8)	(1,161.5)	(596.7)
Fixed maturity securities sales	465.5	380.3	377.6
Fixed maturity securities maturities, paydowns, calls and redemptions	689.5	539.7	291.9
Equity securities purchases	(2.3)	(4.5)	(2.5)
Equity securities sales, calls, and repayments	23.3	16.3	18.7
Limited partnership interests purchases	(68.8)	(74.8)	(207.2)
Limited partnership interests sales	98.8	119.5	41.4
Change in short-term and other investments, net	(100.5)	42.0	(39.8)
Other, net	(9.8)	7.2	9.2
Net cash used in investing activities	(252.1)	(135.8)	(107.4)
Cash flows - financing activities
Dividends paid to shareholders	(57.1)	(55.5)	(53.9)
Proceeds from issuance of Senior Notes	295.2	0.0	297.7
Principal repayment on Senior Notes	(250.0)	0.0	0.0
Principal repayment on Revolving Credit Facility	0.0	0.0	(249.0)
Treasury stock acquired	(20.8)	(8.6)	(6.5)
Proceeds from exercise of stock options	5.3	5.1	0.0
Withholding tax payments on RSUs tendered	(3.4)	(1.8)	(1.8)
Annuity contracts: variable, fixed and FHLB funding agreements
Deposits	1,028.4	796.1	787.6
Benefits, withdrawals and net transfers to Separate Account variable annuity assets	(640.1)	(637.0)	(604.7)
Repayment of FHLB funding agreements	(509.5)	(270.0)	(189.5)
Life policy accounts deposits, withdrawals, and surrenders	19.6	11.7	8.6
Change in deposit asset on reinsurance	(161.6)	(162.4)	(123.6)
Net increase (decrease) in reverse repurchase agreements	(12.0)	12.0	(70.2)
Change in book overdrafts	(5.7)	2.5	(2.5)
Net cash used in financing activities	(311.7)	(307.9)	(207.8)
Net increase (decrease) in cash	(10.6)	8.4	(13.1)
Cash at beginning of year	38.1	29.7	42.8
Cash at end of year	$ 27.5	$ 38.1	$ 29.7