Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities:
Net Income	$ 162.5	$ 101.5
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Increase in Deferred Policy Acquisition Costs	(5.1)	(12.7)
Amortization of Life Insurance in Force Acquired and Customer Relationships Acquired	6.3	5.9
Equity in Earnings of Equity Method Limited Liability Investments	(19.9)	(7.2)
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	15.1	10.7
Amortization of Investment Securities and Depreciation of Investment Real Estate	12.4	11.3
Net Realized Gains on Sales of Investments	(78.3)	(59.9)
Net Impairment Losses Recognized in Earnings	6.3	4.1
Net Gain on Sale of Portfolio of Automobile Loan Receivables	0	(12.9)
Benefit for Loan Losses	0	(2.0)
Depreciation of Property and Equipment	12.7	11.1
Decrease in Receivables	13.5	4.6
Decrease in Insurance Reserves	(47.3)	(1.6)
Increase (Decrease) in Unearned Premiums	(15.6)	8.1
Change in Income Taxes	34.3	10.5
Decrease in Accrued Expenses and Other Liabilities	(36.2)	(1.0)
Other, Net	32.2	29.1
Net Cash Provided by Operating Activities	92.9	99.6
Investing Activities:
Sales, Paydowns and Maturities of Fixed Maturities	578.5	784.7
Purchases of Fixed Maturities	(667.4)	(574.0)
Sales of Equity Securities	107.3	30.8
Purchases of Equity Securities	(136.0)	(118.7)
Sales of and Return of Investment of Equity Method Limited Liability Investments	26.5	31.8
Acquisitions of Equity Method Limited Liability Investments	(8.3)	(18.5)
Decrease (Increase) in Short-term Investments	39.7	(49.9)
Improvements of Investment Real Estate	(4.9)	(3.7)
Sales of Investment Real Estate	102.5	0
Increase in Other Investments	(6.5)	(8.5)
Acquisition of Software	(12.5)	(20.9)
Disposition of Business, Net of Cash Disposed	3.8	0
Net Proceeds from Sale of Portfolio of Automobile Loan Receivables	0	17.7
Receipts from Automobile Loan Receivables	0	2.0
Other, Net	(8.5)	(5.9)
Net Cash Provided by Investing Activities	14.2	66.9
Financing Activities:
Repayments of Notes Payable	5.5	0
Common Stock Repurchases	(82.9)	(57.7)
Cash Dividends Paid to Shareholders	(41.5)	(42.9)
Cash Exercise of Stock Options	0.6	0
Excess Tax Benefits from Share-based Awards	0.9	0.2
Other, Net	1.1	1.4
Net Cash Used by Financing Activities	(127.3)	(99.0)
Increase (Decrease) in Cash	(20.2)	67.5
Cash, Beginning of Year	96.3	251.2
Cash, End of Period	$ 76.1	$ 318.7