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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances		$ 7,707.0
Other comprehensive income (loss)		(3.5)	$ 20.0	$ (1.0)
Ending balances		9,022.7	7,707.0
Currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances		(23.0)	(43.0)	(42.0)
Other comprehensive income before reclassifications and income taxes		(4.5)	25.0	(1.4)
Reclassification adjustments recognized in non-operating income		(2.4)	6.8	(0.1)
Other comprehensive income (loss), before taxes		(6.9)	31.8	(1.5)
Net deferred tax benefits (income taxes)		3.4	(11.8)	0.5
Other comprehensive income (loss)		(3.5)	20.0	(1.0)
Ending balances		(26.5)	(23.0)	(43.0)
Currency translation adjustments | Equity method investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances		(43.6)	(46.9)	(48.8)
Other comprehensive income before reclassifications and income taxes		7.0	2.1	2.4
Reclassification adjustments recognized in non-operating income		0.0	7.5	0.0
Other comprehensive income (loss), before taxes		7.0	9.6	2.4
Net deferred tax benefits (income taxes)		(0.1)	(6.3)	(0.5)
Other comprehensive income (loss)		6.9	3.3	1.9
Ending balances		(36.7)	(43.6)	(46.9)
Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances		20.6	3.9	6.8
Other comprehensive income before reclassifications and income taxes		(11.5)	22.9	(3.8)
Reclassification adjustments recognized in non-operating income		(2.4)	(0.7)	(0.1)
Other comprehensive income (loss), before taxes		(13.9)	22.2	(3.9)
Net deferred tax benefits (income taxes)		3.5	(5.5)	1.0
Other comprehensive income (loss)		(10.4)	16.7	(2.9)
Ending balances		10.2	20.6	3.9
Total net deferred tax benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances		(23.0)	(43.0)	(42.0)
Other comprehensive income before reclassifications and income taxes		(4.5)	25.0	(1.4)
Reclassification adjustments recognized in non-operating income		(2.4)	6.8	(0.1)
Other comprehensive income (loss), before taxes		(6.9)	31.8	(1.5)
Net deferred tax benefits (income taxes)		3.4	(11.8)	0.5
Other comprehensive income (loss)	[1]	(3.5)	20.0	(1.0)
Ending balances		$ (26.5)	$ (23.0)	$ (43.0)
[1] Accumulated other comprehensive income

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