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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash Flows from Operating Activities:
Net Income	$ 123.2	$ 64.0
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Net Realized Investment (Gains) Losses	(13.8)	(16.5)
Impairment Losses	4.0	12.0
Depreciation and Amortization of Property, Equipment and Software	11.1	8.0
Amortization of Intangibles Assets Acquired	3.2	4.7
(Increase) Decrease in Value of Equity and Convertible Securities	(52.2)	117.8
Receivables from Policyholders	(66.7)	(94.3)
Reinsurance Recoverables	5.0	9.8
Deferred Policy Acquisition Costs	(21.3)	(13.8)
Insurance Reserves	29.8	(29.4)
Unearned Premiums	97.9	75.9
Income Taxes	(37.3)	14.7
Other Assets and Liabilities	60.4	(89.9)
Net Cash Provided by Operating Activities	140.6	62.3
Cash Flows from Investing Activities:
Proceeds from Sales, Calls and Maturities of Fixed Maturities	291.2	225.5
Proceeds from the Sales or Paydowns of Investments:
Equity Securities	27.3	372.1
Real Estate Investments	0.0	1.9
Mortgage Loans	12.8	8.5
Other Investments	7.0	4.0
Purchases of Investments:
Fixed Maturities	(503.2)	(393.9)
Equity Securities	(12.5)	(290.0)
Real Estate Investments	(0.2)	(0.1)
Corporate-owned Life Insurance	(100.0)	(100.0)
Mortgage Loans	(33.7)	(4.6)
Other Investments	(50.1)	(9.2)
Net Sales (Purchases) of Short-term Investments	677.4	301.8
Acquisition of Software and Long-lived Assets	(9.2)	(20.1)
Other	4.9	(1.9)
Net Cash Provided by Investing Activities	311.7	94.0
Cash Flows from Financing Activities:
Repayment of Long-term Debt	(50.0)	0.0
Proceeds from Policyholder Obligations	60.7	156.6
Repayment of Policyholder Obligations	(61.5)	(36.2)
Proceeds from Shares Issued under Employee Stock Purchase Plan	1.2	1.0
Common Stock Repurchases	(42.1)	(95.9)
Dividends and Dividend Equivalents Paid	(21.0)	(20.0)
Other	1.7	2.7
Net Cash (Used in) Provided by Financing Activities	(111.0)	8.2
Increase in Cash	341.3	164.5
Cash, Beginning of Year	206.1	136.8	$ 136.8
Cash, End of Period	547.4	301.3	$ 206.1
Equity Method Limited Liability Investments
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Income (Loss) from Equity Method Investments	18.1	0.7
Alternative Energy Partnership Investments
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Income (Loss) from Equity Method Investments	$ (15.4)	$ 0.0

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