Subsequent Events (Details) - Infinity [Member] - USD ($) $ / shares in Units, $ in Billions	12 Months Ended
Dec. 31, 2017	Jul. 02, 2018
Subsequent Event [Line Items]
Premiums Written, Net	$ 1.4
Kemper's 2-12-18 Closing Price per share [Member]
Subsequent Event [Line Items]
Share Price		$ 74.53
Total Merger Value		$ 1.5

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Name:	us-gaap_PremiumsWrittenNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration