Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows from Operating Activities:
Net Income (Loss)	$ (169.5)	$ 60.6
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by (Used in) Operating Activities:
Net Realized Investment (Gains) Losses	(12.5)	(33.1)
Impairment Losses	13.8	7.2
Depreciation and Amortization of Property, Equipment and Software	26.5	22.2
Amortization of Intangibles Acquired	11.2	30.6
Loss from Early Extinguishment of Debt	3.7	0.0
Change in Accumulated Undistributed Earnings of Equity Method Limited Liability Investments	(18.3)	(38.9)
(Increase) Decrease in Value of Equity and Convertible Securities	68.7	(93.0)
Receivables from Policyholders	43.6	(136.4)
Reinsurance Recoverables	0.3	21.2
Deferred Policy Acquisition Costs	(2.9)	(63.5)
Insurance Reserves	12.9	248.8
Unearned Premiums	(44.3)	175.2
Income Taxes	(49.1)	(67.3)
Other Assets and Liabilities	4.3	81.0
Net Cash Provided by (Used in) Operating Activities	(90.0)	237.7
Cash Flows from Investing Activities:
Proceeds from Sales, Calls and Maturities of Fixed Maturities	564.9	726.1
Proceeds from the Sales or Paydowns of Investments:
Equity Securities	403.7	81.6
Real Estate Investments	0.0	2.3
Mortgage Loans	46.6	30.3
Other Investments	36.9	57.9
Purchases of Investments:
Fixed Maturities	(1,025.9)	(967.1)
Equity Securities	(39.1)	(38.4)
Real Estate Investments	(2.9)	(1.3)
Company-Owned Life Insurance	(100.0)	(100.0)
Mortgage Loans	(45.0)	(65.5)
Other Investments	4.9	72.8
Net Sales (Purchases) of Short-term Investments	54.0	605.7
Payments to Acquire Businesses, Net of Cash Acquired	0.0	(316.5)
Acquisition of Software and Long-lived Assets	(23.7)	(25.5)
Other	2.9	5.3
Net Cash Provided by (Used in) Investing Activities	(132.5)	(77.9)
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	289.6	132.7
Repayment of Policyholder Obligations	(89.3)	(156.8)
Proceeds from Shares Issued under Employee Stock Purchase Plan	2.5	2.5
Common Stock Repurchases	0.0	(151.7)
Dividends and Dividend Equivalents Paid	(40.0)	(41.2)
Other	0.3	3.7
Net Cash Provided by (Used in) Financing Activities	422.9	(260.8)
Increase (Decrease) in Cash	200.4	(101.0)
Cash, Beginning of Year	148.2	206.1
Cash, End of Period	348.6	105.1
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	$ (21.6)	$ (23.1)