CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023		Dec. 31, 2022
Cash flows - operating activities
Net income	$ 102.8	$ 45.0		$ 19.8	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Net investment losses	17.3	24.0		56.5	[2]
Depreciation and intangible asset amortization	26.4	26.2		27.6	[2]
Share-based compensation expense	9.9	9.5		8.9	[2]
Loss (gain) from equity method investments, net of dividends or distributions	35.5	(14.5)		18.2	[2]
Other expense - goodwill impairments	0.0	0.0		4.8	[1]
Changes in:
Insurance liabilities	82.8	186.7		334.2	[2]
Amounts due under reinsurance agreements	55.7	(12.5)		(309.8)	[2]
Income tax liabilities	28.2	(15.0)		110.5	[2]
Other operating assets and liabilities	101.4	53.9		(109.4)	[2]
Contributions to defined benefit plan	(1.4)	0.0		0.0
Other, net	(6.5)	(1.2)		10.2	[2]
Net cash provided by operating activities	452.1	302.1		171.5	[2]
Cash flows - investing activities
Fixed maturity securities purchases	(1,161.5)	(596.7)		(1,046.4)	[2]
Fixed maturity securities sales	380.3	377.6		752.0	[2]
Fixed maturity securities maturities, paydowns, calls and redemptions	539.7	291.9		496.8	[2]
Equity securities purchases	(4.5)	(2.5)		(5.2)	[2]
Equity securities sales and repayments	16.3	18.7		12.0	[2]
Limited partnership interests purchases	(74.8)	(207.2)		(356.4)	[2]
Limited partnership interests sales	119.5	41.4		66.6	[2]
Change in short-term and other investments, net	42.0	(39.8)		40.0	[2]
Acquisition of business, net of cash acquired	0.0	0.0		(164.4)	[2]
Other, net	7.2	9.2		(9.6)	[2]
Net cash used in investing activities	(135.8)	(107.4)		(214.6)	[2]
Cash flows - financing activities
Dividends paid to shareholders	(55.5)	(53.9)		(52.6)	[2]
Proceeds from issuance of 2023 Senior Notes due 2028	0.0	297.7		0.0	[2]
Principal repayment on Revolving Credit Facility	0.0	(249.0)		0.0	[2]
Principal repayment on FHLB borrowings	0.0	0.0		(5.0)	[2]
Treasury stock acquired	(8.6)	(6.5)		(24.0)	[2]
Proceeds from exercise of stock options	5.1	0.0		0.0	[2]
Withholding tax payments on RSUs tendered	(1.8)	(1.8)		(2.4)	[2]
Annuity contracts: variable, fixed and FHLB funding agreements
Deposits	796.1	787.6		636.5	[2]
Benefits, withdrawals and net transfers to Separate Account variable annuity assets	(637.0)	(604.7)		(472.2)	[2]
Repayment of FHLB funding agreements	(270.0)	(189.5)		(149.0)	[2]
Life policy accounts deposits, withdrawals, and surrenders	11.7	8.6		7.8	[2]
Change in deposit asset on reinsurance	(162.4)	(123.6)		(67.0)	[2]
Net increase (decrease) in reverse repurchase agreements	12.0	(70.2)		70.2	[2]
Change in book overdrafts	2.5	(2.5)		9.9	[2]
Net cash used in financing activities	(307.9)	(207.8)		(47.8)	[2]
Net increase (decrease) in cash	8.4	(13.1)		(90.9)	[2]
Cash at beginning of year	29.7	42.8	[2]	133.7	[2]
Cash at end of year	$ 38.1	$ 29.7		$ 42.8	[2]

[1] Recast for the adoption of ASU 2018-12.

[2] Recast for the adoption of ASU 2018-12.