Summary of Significant Accounting Policies Losses, Claims and Settlement Expenses - Consolidated (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Gross	$ 9,433.5		$ 9,303.3		$ 8,786.6		$ 8,814.6
Liability for Unpaid Claims and Claims Adjustment Expense, Net	6,456.2		5,878.5		5,869.3
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	2,523.7		2,653.1		2,608.5
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(299.1)		95.1		122.6
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	2,224.5	[1]	2,748.2	[1]	2,731.1	[1]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	695.9		668.1		709.2
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	1,388.0		1,502.3		2,012.6
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, excluding the reclassification of Consumer Credit Indemnity coverage	2,083.9	[2]	2,170.5	[2]	2,721.9	[2]
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	6,596.8	[3]	6,456.2	[3]	5,878.5	[3]
Net Reserve Increase (Decrease)	140.6		577.6		9.2
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	2,651.0		2,436.1		2,240.4
One year development of consolidated reserves	4.60%		(1.60%)		(2.10%)
Three year average annual development of consolidated reserves	0.30%
General Insurance Segment [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net	4,048.9		3,874.9		3,888.0
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	1,857.9		1,729.6		1,575.3
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(23.7)		(51.5)		(130.9)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	620.8		587.8		569.8
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	928.2		916.1		887.6
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years, Excluding the Reclassification of Consumer Credit Indemnity Coverage	(40.4)		(19.8)		(149.2)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, excluding the reclassification of Consumer Credit Indemnity coverage	1,597.5		1,577.9		1,551.1
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	4,334.1	[3]	4,048.9	[3]	3,874.9	[3]
Net Reserve Increase (Decrease)	285.1		174.0		(13.1)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	2,118.4		1,947.0		1,878.2
RFIG Run-off Business [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net	1,994.8		1,654.0		1,663.1
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	487.5	[1]	762.2	[1]	887.1	[1]
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(269.7)	[1]	148.2	[1]	254.8	[1]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	39.4	[2]	46.6	[2]	100.5	[2]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	398.9	[2]	523.0	[2]	1,050.5	[2]
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years, Excluding the Reclassification of Consumer Credit Indemnity Coverage	(253.0)		116.5		273.2
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, excluding the reclassification of Consumer Credit Indemnity coverage	389.8		495.7		1,057.4
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	1,774.2	[3]	1,994.8	[3]	1,654.0	[3]
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve, Current Year	80.5		111.7		223.1
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve, Prior Year	71.9		12.2		(340.8)
Net Reserve Increase (Decrease)	(220.6)		340.7		(9.0)
Insurance Rescission	212.2		262.3		279.5
Deferred Payment Obligation	551.5		299.5
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	121.3		147.5		94.8
Title Insurance Group [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net	396.4		332.0		298.0
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	137.2		120.9		105.7
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(3.1)		0		0
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	6.0		3.0		7.9
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	52.8		53.4		63.6
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	471.5	[3]	396.4	[3]	332.0	[3]
Net Reserve Increase (Decrease)	75.1		64.3		34.0
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	407.1		336.9		262.5
Corporate & Other [Member]
Supplementary Insurance Information, by Segment
Liability for Unpaid Claims and Claims Adjustment Expense, Net	15.9		17.4		20.0
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Current Year	41.0		40.3		40.2
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years	(2.5)		(1.5)		(1.2)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	29.5		30.6		30.7
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	8.0		9.6		10.7
Liability for Unpaid Claims and Claims Adjustment Expense, Net of Reinsurance Losses Recoverable	16.8	[3]	15.9	[3]	17.4	[3]
Net Reserve Increase (Decrease)	0.9		(1.5)		(2.6)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	4.0		4.6		4.6
Reinsurance Recoverable [Member]
Supplementary Insurance Information, by Segment
Reinsurance Recoverables	$ 2,836.7		$ 2,847.0		$ 2,908.1		$ 2,945.3

[1] In common with all other insurance lines, RFIG Run-off mortgage guaranty settled and incurred claim and claim adjustment expenses include only those costs actually or expected to be paid by the Company. As previously noted, changes in mortgage guaranty aggregate case, IBNR, and loss adjustment expense reserves shown below and entering into the determination of incurred claim costs, take into account, among a large number of variables, claim cost reductions for anticipated coverage rescissions and claims denials.The RFIG Run-off mortgage guaranty provision for insured events of the current year was reduced by an estimated $80.5, $111.7 and $223.1, respectively, for 2013, 2012 and 2011. The provision for insured events of prior years in 2013, 2012 and 2011 was reduced (increased) by an estimated $71.9, $12.2 and $(340.8), respectively. These changes were offset to varying degrees by differences between actual claim settlements relative to expected experience and by subsequent revisions of assumptions in regards to claim frequency, severity or levels of associated claim settlement costs which result from consideration of underlying trends and expectations.The following table reflects the changes in net reserves between succeeding balance sheet dates. 2013 2012 2011 Net reserve increase(decrease): General Insurance$285.1 $174.0 $(13.1) Title Insurance75.1 64.3 34.0 RFIG Run-off(220.6) 340.7 (9.0) Other.9 (1.5) (2.6) Total$140.6 $577.6 $9.2

[2] Rescissions reduced the Company's settled losses by an estimated $212.2, $262.3, and $279.5 for 2013, 2012, and 2011, respectively. 2013 and 2012 RFIG Run-off Business claim and claim adjustment expense payments reflect the retention of the DPO within claim reserves which amounted to $551.5 and $299.5 as of the respective year-ends.

[3] Year end net IBNR reserves for each segment were as follows: 2013 2012 2011 General Insurance$2,118.4 $1,947.0 $1,878.2 Title Insurance407.1 336.9 262.5 RFIG Run-off121.3 147.5 94.8 Other4.0 4.6 4.6 Total$2,651.0 $2,436.1 $2,240.4