Statutory Financial Information of Insurance Subsidiaries (Narratives) (Details) - Property and Casualty Insurance [Member] - Repwest [Member] $ in Millions	9 Months Ended
Dec. 31, 2018 USD ($)
Statutory financial information of insurance subsidiaries:
Statutory accounting practices, statutory amount available for dividend payments	$ 21.7
Dividend payments restrictions schedule, amounts paid	$ 11.4

Amount of dividends available for payment after computation of statutory restrictions on capital surplus.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant