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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, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	$ 5,008.6	$ 4,762.0	$ 5,395.2
Balances, Adjusted			4,765.9
Other comprehensive income (loss)	(15.1)	(42.6)	(49.8)
Balances	5,824.4	5,008.6	4,762.0
Net unrealized holding gains [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	52.2	120.3	165.5
Other comprehensive income (loss) before reclassifications and income taxes	37.4	(7.0)	(4.5)
Reclassification adjustments recognized in non-operating income	(110.2)	(53.0)	(72.5)
Other comprehensive income (loss), before taxes	(72.8)	(60.0)	(77.0)
Net deferred tax benefits (income taxes)	28.5	23.9	31.8
Other comprehensive income (loss)	(44.3)	(36.1)	(45.2)
Balances	7.9	52.2	120.3
Net unrealized holding gains [Member] | Accounting standards update 2015-2 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance			(32.0)
Balances, Adjusted			88.3
Currency translation adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(40.7)	(33.7)	(29.1)
Other comprehensive income (loss) before reclassifications and income taxes	47.8	(8.6)	(13.0)
Reclassification adjustments recognized in non-operating income	(0.1)	(2.2)	5.8
Other comprehensive income (loss), before taxes	47.7	(10.8)	(7.2)
Net deferred tax benefits (income taxes)	(18.5)	4.3	2.6
Other comprehensive income (loss)	29.2	(6.5)	(4.6)
Balances	(11.5)	(40.7)	(33.7)
Currency translation adjustments [Member] | Accounting standards update 2015-2 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance			(0.5)
Balances, Adjusted			(34.2)
Currency translation adjustments [Member] | Equity method investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(32.3)	(30.9)	(25.7)
Other comprehensive income (loss) before reclassifications and income taxes	2.6	(1.6)	(8.1)
Reclassification adjustments recognized in non-operating income	0.0	0.0	0.0
Other comprehensive income (loss), before taxes	2.6	(1.6)	(8.1)
Net deferred tax benefits (income taxes)	(0.9)	0.7	2.9
Other comprehensive income (loss)	1.7	(0.9)	(5.2)
Balances	(30.6)	(32.3)	(30.9)
Currency translation adjustments [Member] | Equity method investments [Member] | Accounting standards update 2015-2 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance			(0.5)
Balances, Adjusted			(31.4)
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(8.4)	(2.8)	(3.4)
Other comprehensive income (loss) before reclassifications and income taxes	45.2	(7.0)	(4.9)
Reclassification adjustments recognized in non-operating income	(0.1)	(2.2)	5.8
Other comprehensive income (loss), before taxes	45.1	(9.2)	0.9
Net deferred tax benefits (income taxes)	(17.6)	3.6	(0.3)
Other comprehensive income (loss)	27.5	(5.6)	0.6
Balances	19.1	(8.4)	(2.8)
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] | Accounting standards update 2015-2 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance			0.0
Balances, Adjusted			(2.8)
Total accumulated other comprehensive income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	11.5	86.6	136.4
Balances, Adjusted			54.1
Other comprehensive income (loss) before reclassifications and income taxes	85.2	(15.6)	(17.5)
Reclassification adjustments recognized in non-operating income	(110.3)	(55.2)	(66.7)
Other comprehensive income (loss), before taxes	(25.1)	(70.8)	(84.2)
Net deferred tax benefits (income taxes)	10.0	28.2	34.4
Other comprehensive income (loss)	(15.1)	(42.6)	(49.8)
Balances	$ (3.6)	$ 11.5	86.6
Total accumulated other comprehensive income [Member] | Accounting standards update 2015-2 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance			(32.5)
Balances, Adjusted			$ 54.1

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