Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities:
Net Income	$ 92.4	$ 45.9
Adjustments to Reconcile Net Income to Net Cash Provided (Used) by Operating Activities:
Increase in Deferred Policy Acquisition Costs	(5.0)	(9.5)
Amortization of Life Insurance in Force Acquired and Customer Relationships Acquired	4.2	4.1
Equity in Earnings of Equity Method Limited Liability Investments	(12.2)	(7.8)
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	8.0	7.7
Amortization of Investment Securities and Depreciation of Investment Real Estate	8.6	7.1
Net Realized Gains on Sales of Investments	(29.2)	(9.0)
Net Impairment Losses Recognized in Earnings	2.9	0.9
Net Gain on Sale of Portfolio of Automobile Loan Receivables	0	(12.4)
Benefit for Loan Losses	0	(2.0)
Depreciation of Property and Equipment	8.6	6.2
Decrease in Receivables	9.0	12.0
Increase (Decrease) in Insurance Reserves	(24.3)	8.1
Decrease in Unearned Premiums	(10.6)	(0.7)
Change in Income Taxes	0.8	(15.0)
Increase in Accrued Expenses and Other Liabilities	4.8	2.2
Other, Net	18.6	18.9
Net Cash Provided by Operating Activities	76.6	56.7
Investing Activities:
Sales and Maturities of Fixed Maturities	465.7	268.9
Purchases of Fixed Maturities	(572.2)	(191.1)
Sales of Equity Securities	50.7	28.2
Purchases of Equity Securities	(62.8)	(61.7)
Sales of and Return of Investment of Equity Method Limited Liability Investments	18.9	16.4
Acquisitions of Equity Method Limited Liability Investments	(5.3)	(16.1)
Decrease (Increase) in Short-term Investments	87.3	(25.3)
Improvements of Investment Real Estate	(2.7)	(2.7)
Sales of Investment Real Estate	3.8	0
Increase in Other Investments	(3.7)	(4.2)
Acquisition of Software	(9.8)	(14.8)
Disposition of Business, Net of Cash Disposed	3.8	0
Net Proceeds from Sale of Portfolio of Automobile Loan Receivables	0	13.2
Receipts from Automobile Loan Receivables	0	2.0
Other, Net	(5.2)	(4.6)
Net Cash Provided (Used) by Investing Activities	(31.5)	8.2
Financing Activities:
Common Stock Repurchases	(45.1)	(39.3)
Cash Dividends Paid to Shareholders	(27.9)	(28.8)
Cash Exercise of Stock Options	0.1	0
Excess Tax Benefits from Share-based Awards	0.4	0.6
Other, Net	0.6	0.9
Net Cash Used by Financing Activities	(71.9)	(66.6)
Decrease in Cash	(26.8)	(1.7)
Cash, Beginning of Year	96.3	251.2
Cash, End of Period	$ 69.5	$ 249.5