Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities:
Net Income (Loss)	$ (14.4)	$ 81.1
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Increase in Deferred Policy Acquisition Costs	(11.8)	(22.5)
Amortization of Intangible Assets Acquired	4.5	12.8
Equity in Earnings of Equity Method Limited Liability Investments	(3.3)	(11.8)
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	10.3	4.7
Decrease (Increase) in Value of Fair Value Option Investments Reported in Investment Income	3.9	(1.8)
Amortization of Investment Securities and Depreciation of Investment Real Estate	11.7	11.7
Net Realized Gains on Sales of Investments	(24.0)	(42.7)
Net Impairment Losses Recognized in Earnings	24.0	12.5
Loss from Early Extinguishment of Debt	0.0	9.1
Depreciation of Property and Equipment	10.5	10.0
Write-off of Long-lived Asset	0.0	11.1
Decrease (Increase) in Receivables	(23.8)	29.4
Increase in Insurance Reserves	177.6	16.7
Increase in Unearned Premiums	23.9	6.8
Change in Income Taxes	(30.2)	(16.2)
Increase in Accrued Expenses and Other Liabilities	2.0	27.1
Other, Net	9.6	29.6
Net Cash Provided by Operating Activities	170.5	167.6
Investing Activities:
Sales, Paydowns and Maturities of Fixed Maturities	422.4	538.5
Purchases of Fixed Maturities	(539.8)	(518.1)
Sales of Equity Securities	107.2	207.4
Purchases of Equity Securities	(64.8)	(121.0)
Return of Investment of Equity Method Limited Liability Investments	22.6	30.3
Acquisitions of Equity Method Limited Liability Investments	(20.2)	(21.9)
Sales of Fair Value Option Investments	50.5	0.0
Purchases of Fair Value Option Investments	16.0	111.0
Decrease (Increase) in Short-term Investments	(68.5)	64.7
Improvements of Investment Real Estate	(1.8)	(1.1)
Sales of Investment Real Estate	7.5	0.0
Increase in Other Investments	(3.4)	(2.1)
Purchases of Corporate-owned Life Insurance	(7.5)	(7.5)
Acquisition of Software	(8.8)	(7.4)
Acquisition of Business, Net of Cash Acquired	0.0	(57.6)
Other, Net	(2.0)	(2.8)
Net Cash Used by Investing Activities	(122.6)	(9.6)
Financing Activities:
Net Proceeds from Issuances of Debt	10.0	288.8
Repayments of Debt	(10.0)	(300.3)
Common Stock Repurchases	(3.8)	(41.2)
Dividends and Dividend Equivalents Paid	(36.9)	(37.3)
Cash Exercise of Stock Options	1.2	2.1
Other, Net	1.0	0.9
Net Cash Used by Financing Activities	(38.5)	(87.0)
Increase in Cash	9.4	71.0
Cash, Beginning of Year	161.7	76.1
Cash, End of Period	$ 171.1	$ 147.1