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Consolidation - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Variable Interest Entities [Line Items]
Fee waivers	$ 174,600,000		$ 110,200,000	$ 490,000,000.0	$ 310,700,000
VIE
Variable Interest Entities [Line Items]
Investment redeemed		$ 6,000,000.0
AUM	303,600,000			303,600,000		$ 9,600,000,000
VIE | Other Long-Term Assets
Variable Interest Entities [Line Items]
Maximum risk of loss from non-consolidated VIEs	7,700,000			7,700,000
VIE | Cash and Cash Equivalents
Variable Interest Entities [Line Items]
Maximum risk of loss from non-consolidated VIEs						111,900,000
VIE | Receivables - Affiliates
Variable Interest Entities [Line Items]
Maximum risk of loss from non-consolidated VIEs	700,000			700,000		$ 15,400,000
Financial Support, Fee Waivers
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	145,100,000		81,500,000	386,800,000	223,300,000
Financial Support, Capital Contributions
Variable Interest Entities [Line Items]
Money market funds which meet the scope exception of the consolidation guidance	$ 0		$ 0	$ 0	$ 0

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