Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net Income (Loss)	$ (2.1)	$ 13.5
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Increase in Deferred Policy Acquisition Costs	(2.9)	(2.3)
Amortization of Intangible Assets Acquired	1.6	1.6
Equity in Losses of Equity Method Limited Liability Investments	4.3	0.7
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	5.4	0.4
Decrease (Increase) in Value of Fair Value Option Investments Reported in Investment Income	2.6	(0.9)
Amortization of Investment Securities and Depreciation of Investment Real Estate	4.3	2.7
Net Realized Gains on Sales of Investments	(6.8)	(3.4)
Net Impairment Losses Recognized in Earnings	9.3	7.0
Loss from Early Extinguishment of Debt	0.0	9.1
Depreciation of Property and Equipment	4.0	3.2
Increase in Receivables	(10.1)	(8.4)
Increase in Insurance Reserves	54.6	11.5
Increase (Decrease) in Unearned Premiums	8.5	(6.9)
Change in Income Taxes	(4.6)	(10.5)
Increase in Accrued Expenses and Other Liabilities	5.1	1.9
Other, Net	4.0	9.8
Net Cash Provided by Operating Activities	77.2	29.0
Investing Activities:
Sales, Paydowns and Maturities of Fixed Maturities	142.0	121.7
Purchases of Fixed Maturities	(102.7)	(92.3)
Sales of Equity Securities	41.6	18.7
Purchases of Equity Securities	(19.0)	(11.7)
Return of Investment of Equity Method Limited Liability Investments	5.5	16.3
Acquisitions of Equity Method Limited Liability Investments	(15.0)	(4.7)
Increase in Short-term Investments	(111.7)	(15.2)
Improvements of Investment Real Estate	(0.9)	(0.6)
Increase in Other Investments	(1.0)	(1.1)
Acquisition of Software	(1.3)	(2.9)
Other, Net	(0.5)	(0.5)
Net Cash Provided (Used) by Investing Activities	(63.0)	27.7
Financing Activities:
Net Proceeds from Issuances of Debt	10.0	267.8
Repayments of Debt	(10.0)	(279.3)
Common Stock Repurchases	(3.8)	(23.4)
Dividends and Dividend Equivalents Paid	(12.2)	(12.3)
Cash Exercise of Stock Options	0.0	1.6
Other, Net	0.5	0.5
Net Cash Used by Financing Activities	(15.5)	(45.1)
Increase (Decrease) in Cash	(1.3)	11.6
Cash, Beginning of Year	161.7	76.1
Cash, End of Period	$ 160.4	$ 87.7