Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities:
Net Income	$ 81.1	$ 49.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Increase in Deferred Policy Acquisition Costs	(22.5)	(3.8)
Amortization of Intangible Assets Acquired	12.8	5.4
Equity in Earnings of Equity Method Limited Liability Investments	(11.8)	(9.7)
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	4.7	14.4
Increase in Value of Fair Value Option Investments Reported in Investment Income	(1.8)	(0.6)
Amortization of Investment Securities and Depreciation of Investment Real Estate	11.7	11.3
Net Realized Gains on Sales of Investments	(42.7)	(18.1)
Net Impairment Losses Recognized in Earnings	12.5	8.7
Loss from Early Extinguishment of Debt	9.1	0.0
Depreciation of Property and Equipment	10.0	13.0
Write-offs of Long-lived Assets	11.1	54.6
Decrease in Receivables	29.4	21.0
Increase (Decrease) in Insurance Reserves	16.7	(20.1)
Increase (Decrease) in Unearned Premiums	6.8	(30.7)
Change in Income Taxes	(16.2)	(12.9)
Increase in Accrued Expenses and Other Liabilities	27.1	0.1
Other, Net	29.6	17.7
Net Cash Provided by Operating Activities	167.6	99.4
Investing Activities:
Sales, Paydowns and Maturities of Fixed Maturities	538.5	454.1
Purchases of Fixed Maturities	(518.1)	(404.3)
Sales of Equity Securities	207.4	84.4
Purchases of Equity Securities	(121.0)	(95.1)
Return of Investment of Equity Method Limited Liability Investments	30.3	37.4
Acquisitions of Equity Method Limited Liability Investments	(21.9)	(19.8)
Sales of Fair Value Option Investments	0.0	2.9
Purchases of Fair Value Option Investments	(111.0)	(52.9)
Decrease (Increase) in Short-term Investments	64.7	(34.1)
Improvements of Investment Real Estate	(1.1)	(1.9)
Sales of Investment Real Estate	0.0	0.9
Increase in Other Investments	(2.1)	(5.4)
Purchases of Corporate-owned Life Insurance	7.5	33.5
Acquisition of Software	(7.4)	(8.5)
Acquisition of Business, Net of Cash Acquired	57.6	0.0
Disposition of Subsidiary, Net of Cash Disposed	0.0	8.9
Other, Net	(2.8)	(5.4)
Net Cash Used by Investing Activities	(9.6)	(72.3)
Financing Activities:
Net Proceeds from Issuances of Debt	288.8	144.2
Repayments of Debt	(300.3)	0.0
Common Stock Repurchases	(41.2)	(106.5)
Dividends and Dividend Equivalents Paid	(37.3)	(39.2)
Cash Exercise of Stock Options	2.1	0.0
Other, Net	0.9	1.0
Net Cash Used by Financing Activities	(87.0)	(0.5)
Increase in Cash	71.0	26.6
Cash, Beginning of Year	76.1	66.5
Cash, End of Period	$ 147.1	$ 93.1