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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions				3 Months Ended
		Jan. 01, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		$ 5,824.4		$ 5,824.4
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018	[1]		$ 14.5
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018		2.3	0.0
Balances, As Adjusted			5,838.9
Other comprehensive income (loss)				7.4
Balances			5,824.4	5,901.9
Net unrealized holding gains [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		7.9		7.9
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018			(7.9)
Balances, As Adjusted			0.0
Other comprehensive income before reclassifications and income taxes				0.0
Reclassification adjustments recognized in non-operating income				0.0
Other comprehensive income (loss), before taxes				0.0
Net deferred tax income taxes				0.0	$ 11.5
Other comprehensive income (loss)				0.0
Balances			7.9	0.0
Currency translation adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		(11.5)		(11.5)
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018			0.0
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018			(2.3)
Balances, As Adjusted			(13.8)
Other comprehensive income before reclassifications and income taxes				13.0
Reclassification adjustments recognized in non-operating income				(3.1)
Other comprehensive income (loss), before taxes				9.9
Net deferred tax income taxes				(2.5)	(0.8)
Other comprehensive income (loss)				7.4
Balances			(11.5)	(6.4)
Currency translation adjustments [Member] | Equity method investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		(30.6)		(30.6)
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018			0.0
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018			(6.4)
Balances, As Adjusted			(37.0)
Other comprehensive income before reclassifications and income taxes				3.8
Reclassification adjustments recognized in non-operating income				0.0
Other comprehensive income (loss), before taxes				3.8
Net deferred tax income taxes				(0.8)
Other comprehensive income (loss)				3.0
Balances			(30.6)	(34.0)
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		19.1		19.1
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018			0.0
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018			4.1
Balances, As Adjusted			23.2
Other comprehensive income before reclassifications and income taxes				9.2
Reclassification adjustments recognized in non-operating income				(3.1)
Other comprehensive income (loss), before taxes				6.1
Net deferred tax income taxes				(1.7)
Other comprehensive income (loss)				4.4
Balances			19.1	27.6
Total accumulated other comprehensive income (loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		(3.6)		(3.6)
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018	[1]		(7.9)
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018			(2.3)
Balances, As Adjusted			(13.8)
Other comprehensive income before reclassifications and income taxes				13.0
Reclassification adjustments recognized in non-operating income				(3.1)
Other comprehensive income (loss), before taxes				9.9
Net deferred tax income taxes				(2.5)	$ 10.7
Other comprehensive income (loss)				7.4
Balances			(3.6)	(6.4)
Retained earnings [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		$ 4,932.9		4,932.9
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018	[1]		22.4
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018			2.3
Balances, As Adjusted			4,957.6
Balances			$ 4,932.9	$ 5,205.0
[1] Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from the U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.

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