Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Earned Premiums	$ 509.9	$ 529.2
Net Investment Income	80.8	77.4
Other Income	0.2	0.2
Net Realized Gains on Sales of Investments	26.9	4.9
Other-than-temporary Impairment Losses:
Total Other-than-temporary Impairment Losses	(2.4)	(0.5)
Portion of Losses Recognized in Other Comprehensive Income	0.5	0
Net Impairment Losses Recognized in Earnings	(1.9)	(0.5)
Total Revenues	615.9	611.2
Expenses:
Policyholders' Benefits and Incurred Losses and Loss Adjustment Expenses	349.2	376.6
Insurance Expenses	158.3	162.4
Interest and Other Expenses	23.8	21.8
Total Expenses	531.3	560.8
Income from Continuing Operations before Income Taxes	84.6	50.4
Income Tax Expense	(26.0)	(14.1)
Income from Continuing Operations	58.6	36.3
Income (Loss) from Discontinued Operations	(0.2)	7.3
Net Income	$ 58.4	$ 43.6
Income from Continuing Operations Per Unrestricted Share:
Basic (in dollars per share)	$ 1.00	$ 0.61
Diluted (in dollars per share)	$ 1.00	$ 0.60
Net Income Per Unrestricted Share:
Basic (in dollars per share)	$ 1.00	$ 0.73
Diluted (in dollars per share)	$ 1.00	$ 0.72
Dividends Paid to Shareholders Per Share (in dollars per share)	$ 0.24	$ 0.24