Variable Interest Entities - Textual (Details) - VIE - entity	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Number of consolidated limited partnership-like entities	9	8
Minimum
Variable Interest Entity [Line Items]
Ownership interest in consolidated entities (percent)	50.00%
Maximum
Variable Interest Entity [Line Items]
Ownership interest in consolidated entities (percent)	75.00%