XML 83 R71.htm IDEA: XBRL DOCUMENT v3.10.0.1

OTHER DISCLOSURES. (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Expense recognized for defined contribution retirement plans	$ 105.6	$ 89.4	$ 80.7
Senior officers [Member] | Supplemental Savings Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Supplemental Savings Plan, minimum deferral period	2 years
Supplemental Savings Plan, maximum deferral period	15 years
Amount of cash incentive compensation senior officers elected to defer	$ 118.9	$ 95.5	$ 83.4
Maximum [Member] | Senior officers [Member] | Supplemental Savings Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferral percentage of cash incentive compensation	100.00%

X

- Definition

Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage Deferred

+ References

No definition available.

+ Details

Name:	trow_DeferredCompensationArrangementwithIndividualCashAwardsGrantedPercentageDeferred
Namespace Prefix:	trow_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Deferred Compensation Arrangement with Individual, Initial Maximum Contractual Term

+ References

No definition available.

+ Details

Name:	trow_DeferredCompensationArrangementwithIndividualInitialMaximumContractualTerm
Namespace Prefix:	trow_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Deferred Compensation Arrangement with Individual, Initial Minimum Contractual Term

+ References

No definition available.

+ Details

Name:	trow_DeferredCompensationArrangementwithIndividualInitialMinimumContractualTerm
Namespace Prefix:	trow_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of commitment made to pay deferred cash remuneration.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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:	us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis=us-gaap_DeferredBonusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: