Information About Segments of Business (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Consolidated Revenues [Abstract]
Consolidated revenues	$ 1,430.6		$ 1,269.9
Net premiums earned	1,057.2		1,060.2
Title, escrow and other fees	75.4		105.4
Sub-total	1,132.7		1,165.6
Total operating revenues	1,239.3		1,265.4
Consolidated net realized investment gains (losses)	191.2		4.5
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Consolidated net realized investment gains (losses)	191.2		4.5
Consolidated income (loss) before income taxes (credits)	296.9		84.5
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	102.5		28.3
Income tax expense (credits) on consolidated net realized investment gains (losses)	66.9		1.5
Risk to capital ratio	25
Total Company Segments [Member]
Consolidated Revenues [Abstract]
Consolidated revenues	1,221.1		1,246.5
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Consolidated income (loss) before income taxes (credits)	106.2		77.3
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	36.0		25.9
General Insurance Group [Member]
Consolidated Revenues [Abstract]
Net premiums earned	656.4		600.2
Net investment income and other income	88.9		81.6
Total operating revenues	745.3		681.8
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	81.8	[1]	76.0	[1]
Interest charges on intercompany financing arrangements	8.1		7.1
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	27.2		25.3
Title Insurance Group [Member]
Consolidated Revenues [Abstract]
Net premiums earned	318.4		355.1
Title, escrow and other fees	75.4		105.4
Sub-total	393.8		460.5
Net investment income and other income	7.9		7.2
Total operating revenues	401.8		467.7
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	4.7	[1]	21.5	[1]
Interest charges on intercompany financing arrangements	1.9		1.9
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	1.9		7.6
RFIG Run-off Business [Member]
Consolidated Revenues [Abstract]
Net premiums earned	65.6		87.7
Net investment income and other income	8.3		9.1
Total operating revenues	73.9		96.9
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	19.5	[1]	(20.2)	[1]
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	6.8		(7.0)
Percentage of claims to be paid In cash	60.00%
Deferred payment obligation, percentage	40.00%
Deferred payment obligation	604.2
Other sources - net [Member]
Consolidated Revenues [Abstract]
Consolidated revenues	33.5	[2]	33.5	[2]
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Consolidated income (loss) before income taxes (credits)	(0.5)	[2]	2.6	[2]
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	(0.4)	[2]	0.7	[2]
Consolidation elimination adjustments [Member]
Consolidated Revenues [Abstract]
Consolidated revenues	(15.3)		(14.7)
Including CCI Run-off Business [Member] | General Insurance Group [Member]
Consolidated Revenues [Abstract]
Net premiums earned	663.2		608.0
Net investment income and other income	89.0		81.7
Total operating revenues	752.3		689.7
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	64.6	[1]	68.9	[1]
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	21.1		22.7
Excluding CCI run-off business [Member] | RFIG Run-off Business [Member]
Consolidated Revenues [Abstract]
Net premiums earned	58.8		79.9
Net investment income and other income	8.1		9.0
Total operating revenues	66.9		89.0
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	36.8	[1]	(13.0)	[1]
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	12.9		(4.5)
All CCI run-off business | General Insurance Group [Member]
Consolidated Revenues [Abstract]
Net premiums earned	6.8		7.8
Net investment income and other income	0.1		0
Total operating revenues	6.9		7.9
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	(17.2)		(7.1)
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	(6.0)		(2.5)
All CCI run-off business | RFIG Run-off Business [Member]
Consolidated Revenues [Abstract]
Net premiums earned	6.8		7.8
Net investment income and other income	0.1		0
Total operating revenues	6.9		7.9
Consolidated Income (Loss) Before Taxes (Credits) [Abstract]
Income (loss) before income taxes (credits) and realized investment gains or losses	(17.2)		(7.1)
Consolidated Income Tax Expense (Credits) [Abstract]
Income tax expense (credits)	$ (6.0)		$ (2.5)

[1] Income (loss) before taxes (credits) is reported net of interest charges on intercompany financing arrangements with Old Republic's holding company parent for the following segments: General - $8.1 and $7.1 for the quarters ended March 31, 2014 and 2013, respectively, and Title - $1.9 for both quarters ended March 31, 2014 and 2013.

[2] Represents amounts for Old Republic's holding company parent, minor corporate services subsidiaries, and a small life and accident insurance operation.