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STOCKHOLDERS' EQUITY. (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Unsettled common stock repurchases liability	$ 2.5	$ 12.2
Common shares authorized for future repurchase (shares)	21,467,311
Restricted stockholders' equity	$ 256.0

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- Definition

Unsettled Common Stock Repurchases Liabilities

+ References

No definition available.

+ Details

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Namespace Prefix:	trow_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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Balance Type:	debit
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X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- References

No definition available.

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