Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Earned Premiums (Changes in Deferred Profit Liability for the Six and Three Months Ended: 2023 - $35.7 and $16.5; 2022 - $37.7 and $17.4)	$ 1,166.9	$ 1,337.6	$ 2,347.8	$ 2,657.6
Net Investment Income	106.3	118.5	208.1	218.5
Change in Value of Alternative Energy Partnership Investments	0.8	(4.9)	1.5	(21.6)
Other Income	1.7	0.9	2.9	3.3
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	2.4	(40.5)	4.1	(68.7)
Net Realized Investment (Losses) Gains	(14.4)	11.0	(8.0)	12.5
Impairment Gains (Losses)	(0.9)	(4.9)	1.2	(13.8)
Total Revenues	1,262.8	1,417.7	2,557.6	2,787.8
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses (Changes in Liability for Future Policyholder Benefits for the Six and Three Months Ended: 2023 - $2.5 and $0.6; 2022 - $20.3 and $1.7)	984.7	1,151.1	2,036.7	2,274.3
Insurance Expenses	266.1	307.7	535.4	612.5
Interest and Other Expenses	78.3	53.5	155.7	107.6
Loss from Early Extinguishment of Debt	0.0	0.0	0.0	3.7
Goodwill, pre tax impairment charge	49.6	0.0	49.6	0.0
Total Expenses	1,378.7	1,512.3	2,777.4	2,998.1
Loss before Income Taxes	(115.9)	(94.6)	(219.8)	(210.3)
Income Tax Benefit	18.8	22.4	42.6	51.8
Net Loss	$ (97.1)	$ (72.2)	$ (177.2)	$ (158.5)
Net Loss Per Unrestricted Share:
Basic (in dollars per share)	$ (1.52)	$ (1.13)	$ (2.77)	$ (2.49)
Diluted (in dollars per share)	$ (1.52)	$ (1.13)	$ (2.77)	$ (2.49)