Discontinued Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Gain on Sale of Loan Portfolios	$ 0	$ 11.3
Income (Loss) from Discontinued Operations before Income Taxes:
Net Gain on Sale of Loan Portfolios	0	11.3
Income (Loss) from Discontinued Operations before Income Taxes	(0.4)	12.3
Income Tax Benefit (Expense)	0.2	(5.0)
Income (Loss) from Discontinued Operations	(0.2)	7.3
Income from Discontinued Operations Per Unrestricted Share:
Basic (in dollars per share)	$ 0.00	$ 0.12
Diluted (in dollars per share)	$ 0.00	$ 0.12
Fireside [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Gain on Sale of Loan Portfolios	0	11.3
Income (Loss) from Discontinued Operations before Income Taxes:
Results of Operations / Change in Estimate of Retained Liabilities Arising from Discontinued Operations	0	(0.2)
Net Gain on Sale of Loan Portfolios	0	11.3
Unitrin Business Insurance [Member]
Income (Loss) from Discontinued Operations before Income Taxes:
Results of Operations / Change in Estimate of Retained Liabilities Arising from Discontinued Operations	$ (0.4)	$ 1.2