Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net Income	$ 36.3	$ 1.9
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangible Assets Acquired	2.6	3.1
Equity in (Earnings) Loss of Equity Method Limited Liability Investments	(10.8)	1.7
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments	11.1	6.1
Decrease (Increase) in Value of Fair Value Option Investments Reported in Investment Income	(0.5)	2.5
Amortization of Investment Securities and Depreciation of Investment Real Estate	8.7	8.5
Net Realized Gains on Sales of Investments	(36.9)	(12.4)
Net Impairment Losses Recognized in Earnings	7.6	15.7
Depreciation of Property and Equipment	6.2	7.2
Increase in Receivables	(9.2)	(6.1)
Increase in Deferred Policy Acquisition Costs	(16.5)	(5.5)
Increase in Insurance Reserves	59.8	89.1
Increase in Unearned Premiums	31.8	9.5
Change in Income Taxes	9.4	(16.2)
Increase in Accrued Expenses and Other Liabilities	6.5	5.6
Other, Net	(2.1)	6.2
Net Cash Provided by Operating Activities	104.0	116.9
Investing Activities:
Sales, Paydowns and Maturities of Fixed Maturities	205.4	263.1
Purchases of Fixed Maturities	(264.4)	(293.0)
Sales of Equity Securities	191.1	75.5
Purchases of Equity Securities	(197.4)	(51.3)
Return of Investment of Equity Method Limited Liability Investments	32.2	19.0
Acquisitions of Equity Method Limited Liability Investments	(9.3)	(18.9)
Sales of Fair Value Option Investments	34.9	27.9
Decrease (Increase) in Short-term Investments	144.2	(109.5)
Improvements of Investment Real Estate	(1.0)	(1.3)
Sales of Investment Real Estate	14.7	4.3
Increase in Other Investments	(0.9)	(2.0)
Acquisition and Development of Software	(21.3)	(3.9)
Other, Net	(3.6)	(1.1)
Net Cash Provided (Used) by Investing Activities	124.6	(91.2)
Financing Activities:
Net Proceeds from Issuance of Long-term Debt	200.2	0.0
Repayment of Long-term Debt	(360.0)	0.0
Common Stock Repurchases	0.0	(3.8)
Dividends and Dividend Equivalents Paid	(24.7)	(24.5)
Cash Exercise of Stock Options	0.9	0.0
Other, Net	0.2	0.7
Net Cash Used by Financing Activities	(183.4)	(27.6)
Increase (Decrease) in Cash	45.2	(1.9)
Cash, Beginning of Year	115.7	161.7
Cash, End of Period	$ 160.9	$ 159.8