Segments - Dispositions by Reportable Segment (Parenthetical) (Details) - property	8 Months Ended	9 Months Ended
	Aug. 31, 2019	Sep. 30, 2019
Master Trust 2014
Segment Reporting Information [Line Items]
Dispositions (in properties)		769
Secured debt | Shopko CMBS Loans
Segment Reporting Information [Line Items]
Dispositions (in properties)	83
Secured debt | Shopko CMBS Loans | Other Properties
Segment Reporting Information [Line Items]
Dispositions (in properties)		83