Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Earned Premiums (Changes in Deferred Profit Liability: 2023 - $19.2; 2022 - $20.3)	$ 1,180.9	$ 1,320.0
Net Investment Income	101.8	100.0
Change in Value of Alternative Energy Partnership Investments	0.7	(16.7)
Other Income	1.2	2.4
Income (Loss) from Change in Fair Value of Equity and Convertible Securities	1.7	(28.2)
Net Realized Investment Gains	6.4	1.5
Impairment Gains (Losses)	2.1	(8.9)
Total Revenues	1,294.8	1,370.1
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses (Changes in Liability for Future Policyholder Benefits: 2023 - $1.9; 2022 - $18.6)	1,052.0	1,123.2
Insurance Expenses	269.3	304.8
Interest and Other Expenses	77.4	54.1
Loss from Early Extinguishment of Debt	0.0	3.7
Total Expenses	1,398.7	1,485.8
Loss before Income Taxes	(103.9)	(115.7)
Income Tax Benefit	23.8	29.4
Net Loss	$ (80.1)	$ (86.3)
Net Loss Per Unrestricted Share:
Basic (in dollars per share)	$ (1.25)	$ (1.36)
Diluted (in dollars per share)	$ (1.25)	$ (1.36)