v2.4.0.6

Discontinued Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest, Loan Fees and Earned Discounts	$ 0	$ 15.4
Other Income	0	0.1
Net Gain on Sale of Loans in Inactive Portfolio	11.3	0
Net Investment Income	0	0.4
Net Realized Gains on Sales of Investments	0	0.3
Total Revenues Included in Discontinued Operations	11.3	16.2
Income (Loss) from Discontinued Operations before Income Taxes:
Net Gain on Sale of Loans in Inactive Portfolio	11.3	0
Income from Discontinued Operations before Income Taxes	12.3	9.4
Income Tax Expense	(5.0)	(2.9)
Income from Discontinued Operations	7.3	6.5
Income from Discontinued Operations Per Unrestricted Share [Abstract]
Basic (in dollars per share)	$ 0.12	$ 0.11
Diluted (in dollars per share)	$ 0.12	$ 0.11
Property and Casualty	1,001.4	1,095.8	1,029.1	1,118.7
Fireside [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Gain on Sale of Loans in Inactive Portfolio	11.3	0
Income (Loss) from Discontinued Operations before Income Taxes:
Results of Operations / Change in Estimate of Retained Liabilities Arising from Discontinued Operations	(0.2)	12.0
Net Gain on Sale of Loans in Inactive Portfolio	11.3	0
Income from Discontinued Operations Per Unrestricted Share [Abstract]
Notional Amount of Sales of Loans Held-for-sale	283
Disposal Group, Including Discontinued Operation, Transaction Costs	14.9
Disposal Group, Including Discontinued Operation, Accrued Transaction Costs	8.7
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	1.2	(2.6)
Income from Discontinued Operations Per Unrestricted Share [Abstract]
Property and Casualty	$ 117.3		$ 125.6

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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