XML 61 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Other Fees Earned from Sponsored U.S. Mutual Funds) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue and Services [Line Items]
Administrative fees	$ 358.3	$ 352.5	$ 361.8
Distribution and servicing fees	147.0	141.7	151.5
T. Rowe Price U.S. mutual funds [Member]
Revenue and Services [Line Items]
Administrative fees	283.1	277.3	292.8
Distribution and servicing fees	$ 147.0	$ 141.7	$ 151.5

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	trow_RevenuesAndServicesLineItems
Namespace Prefix:	trow_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue from providing administrative services, including, but not limited to, accounting, tax, legal, regulatory filing, and share registration activities of managed funds and investment accounts of independent third parties and related and affiliated entities.

+ References

No definition available.

+ Details

Name:	us-gaap_AdministrativeServicesRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of fees from providing distribution services, including but not limited to, marketing and selling fund shares, advertising, printing and mailing of prospectuses and sales literature to investors.

+ References

No definition available.

+ Details

Name:	us-gaap_DistributionFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_MajorCustomersAxis=trow_SponsoredMutualFundsInUSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: