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DELL APPRAISAL RIGHTS MATTER.	12 Months Ended
	Dec. 31, 2020
Unusual or Infrequent Items, or Both [Abstract]
DELL APPRAISAL RIGHTS MATTER	DELL APPRAISAL RIGHTS MATTER. In 2016, we paid $166.2 million to compensate certain U.S. mutual funds, trusts, subadvised clients, and separately managed accounts (collectively, "Clients") for the denial of their appraisal rights by the Delaware Chancery Court ("Court") in connection with the 2013 leveraged buyout of Dell, Inc. ("Dell"). Later in 2016 and 2017, we entered into settlement agreements totaling $150.0 million with our insurance carrier. These insurance proceeds were recognized in operating expenses as an offset to the charge we recognized for compensation paid to Clients in operating expenses. In 2018, all parties settled with Dell, and the Court approved final adjustments to the compensation paid to Clients in final non-appealable judgments. As a result, we obtained repayments from Clients, of which we retained the first $15.2 million and paid the remaining amount received back to our insurers. We recognized $15.2 million as a reduction in operating expenses in 2018. The net impact of the Dell appraisal matter on our financial statements was $1.0 million of operating expenses.

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- Definition

The entire disclosure for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-URI http://asc.fasb.org/subtopic&trid=114868817

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