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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 1,768.7	$ 1,581.2	$ 1,254.0
Currency translation adjustments
Total currency translation adjustments	(63.5)	68.9	(13.3)
Net unrealized holding gains (losses) on available-for-sale investments		37.4	(1.0)
Reclassification of (gains) losses in accumulated other comprehensive income to non-operating investment income:
Capital gain distributions		(3.5)	(6.0)
Net gains realized on dispositions determined using average cost		(83.1)	(53.0)
Net unrealized gains recognized upon the transfer to trading investments		(23.6)	0.0
Total reclassification adjustments		(110.2)	(59.0)
Total net unrealized holding losses recognized in other comprehensive income		(72.8)	(60.0)
Other comprehensive loss before income taxes	(63.5)	(3.9)	(73.3)
Net deferred tax benefits	9.2	10.0	28.2
Total other comprehensive income (loss)	(54.3)	6.1	(45.1)
Total comprehensive income	1,714.4	1,587.3	1,208.9
Less: comprehensive income (loss) attributable to redeemable non-controlling interests	(94.9)	104.6	36.5
Comprehensive income attributable to T. Rowe Price Group	1,809.3	1,482.7	1,172.4
Variable interest entities [Member]
Currency translation adjustments
Consolidated T. Rowe Price investment products—variable interest entities	(44.7)	66.4	(9.5)
Reclassification gains recognized in non-operating investment income upon deconsolidation of certain T. Rowe Price investment products	(3.6)	(0.1)	(2.2)
Total currency translation adjustments	(48.3)	66.3	(11.7)
Equity method investments [Member]
Currency translation adjustments
Total currency translation adjustments	$ (15.2)	$ 2.6	$ (1.6)

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