Information About Segments of Business Textuals (Details) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)	Sep. 30, 2014 USD ($)
Segment Reporting Information
Number of Jurisdictions	16
Number of major segments | segment	3
General Insurance Group [Member]
Segment Reporting Information
Interest charges on intercompany financing arrangements	$ 14.1	$ 12.1
Title Insurance Segment [Member]
Segment Reporting Information
Interest charges on intercompany financing arrangements	$ 2.1	$ 2.1
RFIG Run-off Business [Member]
Segment Reporting Information
Risk to capital ratio	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