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Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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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 operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, 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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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date.

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Discontinued Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Loan Portfolios									$ 0	$ 0	$ 12.9
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Gain on Sale of Loan Portfolios									0	0	12.9
Income from Discontinued Operations before Income Taxes									3.0	4.9	18.9
Income Tax Expense									(1.1)	(1.7)	(7.3)
Income from Discontinued Operations	2.1	(0.1)	0	(0.1)	0.4	1.5	1.5	(0.2)	1.9	3.2	11.6
Income from Discontinued Operations Per Unrestricted Share:
Basic (in dollars per share)									$ 0.04	$ 0.06	$ 0.20
Diluted (in dollars per share)									$ 0.04	$ 0.06	$ 0.20
Property and Casualty	733.9				843.5				733.9	843.5	970.6	1,029.1
Fireside [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Loan Portfolios									0	0	12.9
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Results of Operations									0	0	(0.2)
Gain on Sale of Loan Portfolios									0	0	12.9
Unitrin Business Insurance [Member]
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Results of Operations									3.0	4.9	6.2
Income from Discontinued Operations Per Unrestricted Share:
Property and Casualty	69.3				82.0				69.3	82.0
Inactive Loan Portfolio [Member] \| Fireside [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Loan Portfolios											12.9
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Gain on Sale of Loan Portfolios											$ 12.9