Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Earned Premiums	$ 2,220.0	$ 2,009.6	$ 1,862.2
Net Investment Income	298.3	302.6	309.1
Other Income	3.2	3.7	1.4
Net Realized Gains on Sales of Investments	33.1	52.1	39.1
Other-than-temporary Impairment Losses:
Total Other-than-temporary Impairment Losses	(33.0)	(27.4)	(15.2)
Portion of Losses Recognized in Other Comprehensive Income	0.3	0.2	0.0
Net Impairment Losses Recognized in Earnings	(32.7)	(27.2)	(15.2)
Total Revenues	2,521.9	2,340.8	2,196.6
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses	1,780.8	1,467.6	1,261.7
Insurance Expenses	647.3	645.1	628.4
Write-off of Long-lived Assets	0.0	11.1	54.6
Loss from Early Extinguishment of Debt	0.0	9.1	0.0
Interest and Other Expenses	90.3	107.6	91.7
Total Expenses	2,518.4	2,240.5	2,036.4
Income from Continuing Operations before Income Taxes	3.5	100.3	160.2
Income Tax Benefit (Expense)	9.2	(20.1)	(47.6)
Income (Loss) from Continuing Operations	12.7	80.2	112.6
Discontinued Operations:
Income from Discontinued Operations	4.1	5.5	1.9
Net Income	$ 16.8	$ 85.7	$ 114.5
Income from Continuing Operations Per Unrestricted Share:
Income from Continuing Operations Per Unrestricted Share - Basic (usd pre share)	$ 0.25	$ 1.55	$ 2.08
Income from Continuing Operations Per Unrestricted Share - Diluted (usd per share)	0.25	1.55	2.08
Net Income Per Unrestricted Share:
Net Income Per Unrestricted Share - Basic ( usd per share)	0.33	1.65	2.12
Net Income Per Unrestricted Share - Diluted (usd pre share)	0.33	1.65	2.12
Dividends Paid to Shareholders Per Share (usd per share)	$ 0.96	$ 0.96	$ 0.96