Related Parties - Insurance Income Strategies Ltd. (Details) - USD ($) $ in Millions	Sep. 30, 2019	Aug. 10, 2018
Equity Method Investee
Related Party Transaction [Line Items]
Percentage of assets		0.90%
Percentage of net profits		9.00%
Percentage of future fees		50.00%
Preferred stock issued		$ 15.0
IIS Re Ltd
Related Party Transaction [Line Items]
Ownership percentage by parent	100.00%

Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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