Information About Segments of Business Textuals (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Segment Reporting Information
Number of Jurisdictions	16		16
Number of major segments | segment			3
General Insurance Group [Member]
Segment Reporting Information
Interest charges on intercompany financing arrangements	$ 13.2	$ 10.5	$ 38.6	$ 31.0
Title Insurance Segment [Member]
Segment Reporting Information
Interest charges on intercompany financing arrangements	$ 2.1	$ 2.0	$ 6.3	$ 6.1
RFIG Run-off Business [Member]
Segment Reporting Information
Risk to capital ratio	25		25
Revised deferred payment obligation percentage					40.00%
Percentage of deferred payment obligation to be paid					100.00%
Payment to subsidiary in anticipation of deferred payment obligation					$ 125.0
Deferred Payment Obligation					$ 657.0