Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Investments:
Fixed Maturities at Fair Value (Amortized Cost: 2021 - $7,092.6; 2020 - $6,692.7 Allowance for Credit Losses: 2021 - $5.1; 2020 - $3.3)	$ 7,835,000,000.0	$ 7,605,900,000
Equity Securities at Fair Value (Cost: 2021 - $715.8; 2020 - $684.1)	957,700,000	858,500,000
Equity Securities at Modified Cost	32,500,000	40,100,000
Convertible Securities at Fair Value	43,600,000	39,900,000
Short-term Investments at Cost which Approximates Fair Value	370,600,000	875,400,000
Other Investments	910,800,000	779,000,000.0
Total Investments	10,442,300,000	10,424,100,000
Cash	105,100,000	206,100,000
Premiums Receivable, Net	1,479,900,000	1,194,500,000
Other Receivables	214,900,000	222,400,000
Deferred Policy Acquisition Costs	652,700,000	589,300,000
Goodwill	1,311,900,000	1,114,000,000.0
Current Income Tax Assets	94,200,000	15,600,000
Other Assets	649,700,000	575,900,000
Total Assets	14,950,700,000	14,341,900,000
Insurance Reserves:
Life and Health	3,551,600,000	3,527,500,000
Property and Casualty	2,430,800,000	1,982,500,000
Total Insurance Reserves	5,982,400,000	5,510,000,000.0
Unearned Premiums	1,968,100,000	1,615,100,000
Policyholder Obligations	442,700,000	467,000,000.0
Deferred Income Tax Liabilities	269,600,000	285,700,000
Accrued Expenses and Other Liabilities	859,400,000	727,900,000
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,175.6; 2020 - $1,247.8)	1,122,300,000	1,172,800,000
Total Liabilities	10,644,500,000	9,778,500,000
Shareholders’ Equity:
Common Stock, $0.10 Par Value, 100,000,000 Shares Authorized; 63,636,203 Shares Issued and Outstanding at June 30, 2021 and 65,436,207 Shares Issued and Outstanding at December 31, 2020	6,400,000	6,500,000
Paid-in Capital	1,770,900,000	1,805,200,000
Retained Earnings	1,985,900,000	2,071,200,000
Accumulated Other Comprehensive Income	543,000,000.0	680,500,000
Total Shareholders’ Equity	4,306,200,000	4,563,400,000
Total Liabilities and Shareholders’ Equity	14,950,700,000	14,341,900,000
Equity Method Limited Liability Investments
Investments:
Equity Method Investments	245,500,000	204,000,000.0
Alternative Energy Partnership Investments
Investments:
Equity Method Investments	$ 46,600,000	$ 21,300,000