Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities:
Net Income (Loss)	$ (245.7)	$ (14.7)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by (Used in) Operating Activities:
Net Realized Investment (Gains) Losses	(0.4)	(43.1)
Impairment Losses	22.1	7.8
Depreciation and Amortization of Property, Equipment and Software	38.9	32.8
Amortization of Intangibles Assets Acquired	16.0	46.4
Loss from Early Extinguishment of Debt	3.7	0.0
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	(13.7)	(50.9)
(Increase) Decrease in Value of Equity and Convertible Securities	79.9	(92.4)
Receivables from Policyholders	69.6	(137.7)
Reinsurance Recoverables	(1.8)	24.4
Deferred Policy Acquisition Costs	4.2	(87.3)
Insurance Reserves	(9.3)	429.8
Unearned Premiums	(93.4)	172.9
Income Taxes	(66.2)	(121.5)
Other Assets and Liabilities	4.8	94.2
Net Cash Provided by (Used in) Operating Activities, Total	(170.1)	307.6
Cash Flows from Investing Activities:
Proceeds from Sales, Calls and Maturities of Fixed Maturities	1,019.4	1,015.6
Proceeds from the Sales or Paydowns of Investments:
Equity Securities	458.3	139.7
Real Estate Investments	0.0	6.2
Mortgage Loans	69.9	53.1
Other Investments	41.9	39.7
Payments to Acquire Investments [Abstract]
Payments to Acquire Debt Securities, Available-for-Sale	(1,386.7)	(1,322.2)
Payments to Acquire Equity Securities, FV-NI	(55.3)	(106.0)
Payments to Acquire Real Estate Held-for-investment	(2.9)	(3.6)
Payment to Acquire Life Insurance Policy, Investing Activities	(110.0)	(100.0)
Payments to Acquire Mortgage Notes Receivable	(67.3)	(94.0)
Payments to Acquire Interest in Subsidiaries and Affiliates	9.7	92.1
Net Sales (Purchases) of Short-term Investments	(73.6)	715.1
Payments to Acquire Businesses, Net of Cash Acquired	0.0	(316.6)
Proceeds from Sale of Other Assets, Investing Activities	4.9	0.0
Acquisition of Software and Long-lived Assets	(27.1)	(43.9)
Other	8.6	10.0
Net Cash Provided by (Used in) Investing Activities, Total	(129.6)	(99.0)
Cash Flows from Financing Activities:
Repayment of Long-term Debt	(280.0)	(50.0)
Proceeds from Issuance of Senior Long-term Debt	396.3	0.0
Proceeds from Issuance of Subordinated Long-term Debt	145.6	0.0
Proceeds from Policyholder Obligations	319.9	298.1
Repayment of Policyholder Obligations	(120.1)	(328.1)
Proceeds from Shares Issued under Employee Stock Purchase Plan	3.8	3.9
Common Stock Repurchases	0.0	(161.7)
Dividends and Dividend Equivalents Paid	(59.9)	(60.8)
Other	0.3	3.7
Net Cash Provided by (Used in) Financing Activities, Total	403.8	(294.9)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations [Abstract]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	3.1	0.0
Cash Equivalents, Restricted Cash, And Restricted Cash Equivalents, Excluding Disposal Group Including Discontinued Operations, Period Increase (Decrease), Including Exchange Rate Effect	101.0	(86.3)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	104.1	(86.3)
Cash at beginning of year, Net of Held-for-Sale	148.2	206.1
Cash at end of period, Net of Held-for-Sale	249.2	119.8
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations	252.3	119.8
Cash, Cash Equivalents, Restricted Cash, And Restricted Cash Equivalents, Disposal Group Including Discontinued Operations, Period Increase (Decrease), Including Exchange Rate Effect	3.1	0.0
Senior Notes, 3.800 Percent Due February 23, 2033
Cash Flows from Financing Activities:
Payments of Debt Issuance Costs	(1.2)	0.0
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062
Cash Flows from Financing Activities:
Payments of Debt Issuance Costs	(0.9)	0.0
Alternative Energy Partnership Investments
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by (Used in) Operating Activities:
Income (Loss) from Equity Method Investments	$ (21.2)	$ (46.9)