Selected Quarterly Financial Data (unaudited) Normalized Items (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
ASC [Member]
NetCasualtyGains [Line Items]
Policyholder Benefits and Claims Incurred, Net, Property, Casualty and Liability	$ 8.1

Amount, after effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred for property and casualty insurance contracts.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.5)
-URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263

Name:	us-gaap_IncurredClaimsPropertyCasualtyAndLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration