Acquisitions - Summary of Allocation of Purchase Price (Parenthetical) (Details) - USAA AMCO $ in Thousands	Jul. 01, 2019 USD ($)
Acquisitions
Other intangible assets, net	$ 808,670
Trade Name
Acquisitions
Other intangible assets, net	38,200
Lease-Related Assets
Acquisitions
Other intangible assets, net	400
Investment Advisory Contracts
Acquisitions
Other intangible assets, net	750,200
Transfer Agent Contracts
Acquisitions
Other intangible assets, net	19,100
Distribution Contracts
Acquisitions
Other intangible assets, net	$ 800

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant