Borrowings - Narrative (Details) - USD ($)	1 Months Ended		6 Months Ended
	Apr. 30, 2020	Oct. 31, 2017	Jun. 30, 2020	Nov. 30, 2017
Line of Credit Facility [Line Items]
Forbearance period (days)			90 days
Principal amount of debt deferred			$ 1,300,000,000
Forbearance repayment period (months)			12 months
Colony NorthStar, Inc. | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 15,000,000.0	$ 35,000,000.0	$ 35,000,000.0
Expiration term (in years)		1 year
Line of credit extension term (in months)		6 months
Proceeds drawn under line of credit	$ 35,000,000.0
LIBOR | Colony NorthStar, Inc. | Line of Credit
Line of Credit Facility [Line Items]
Interest rate (percentage)			3.50%