Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Earned Premiums	$ 507.5	$ 527.3	$ 1,530.2	$ 1,586.3
Net Investment Income	82.4	70.4	237.8	223.0
Other Income	0.1	0.2	0.5	0.6
Net Realized Gains on Sales of Investments	49.1	50.9	78.3	59.9
Other-than-temporary Impairment Losses:
Total Other-than-temporary Impairment Losses	(3.5)	(3.2)	(8.2)	(4.1)
Portion of Losses Recognized in Other Comprehensive Income	0.1	0	1.9	0
Net Impairment Losses Recognized in Earnings	(3.4)	(3.2)	(6.3)	(4.1)
Total Revenues	635.7	645.6	1,840.5	1,865.7
Expenses:
Policyholders' Benefits and Incurred Losses and Loss Adjustment Expenses	338.3	368.7	1,041.7	1,169.1
Insurance Expenses	170.1	172.7	491.5	502.8
Interest and Other Expenses	25.3	22.7	74.3	65.4
Total Expenses	533.7	564.1	1,607.5	1,737.3
Income from Continuing Operations before Income Taxes	102.0	81.5	233.0	128.4
Income Tax Expense	(33.4)	(25.9)	(73.3)	(34.9)
Income from Continuing Operations	68.6	55.6	159.7	93.5
Income from Discontinued Operations	1.5	0	2.8	8.0
Net Income	$ 70.1	$ 55.6	$ 162.5	$ 101.5
Income from Continuing Operations Per Unrestricted Share:
Basic (in dollars per share)	$ 1.21	$ 0.95	$ 2.77	$ 1.57
Diluted (in dollars per share)	$ 1.21	$ 0.95	$ 2.76	$ 1.56
Net Income Per Unrestricted Share:
Basic (in dollars per share)	$ 1.24	$ 0.95	$ 2.82	$ 1.71
Diluted (in dollars per share)	$ 1.23	$ 0.95	$ 2.81	$ 1.70
Dividends Paid to Shareholders Per Share (in dollars per share)	$ 0.24	$ 0.24	$ 0.72	$ 0.72