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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income [1] $ 1,581.2 $ 1,254.0 $ 1,223.0
Other comprehensive income (loss)      
Net unrealized holding gains (losses) on available-for-sale investments 37.4 (1.0) (4.5)
Reclassification of (gains) and losses in accumulated other comprehensive income to non-operating investment income:      
Capital gain distributions (3.5) (6.0) (20.8)
Net gains realized on dispositions determined using average cost (83.1) (53.0) (56.5)
Net unrealized gains recognized upon the transfer to trading investments (23.6) 0.0 0.0
Other-than-temporary impairments 0.0 0.0 4.8
Total reclassification adjustments (110.2) (59.0) (72.5)
Total net unrealized holding losses recognized in other comprehensive income (72.8) (60.0) (77.0)
Total currency translation adjustments 68.9 (13.3) (7.2)
Other comprehensive loss before income taxes (3.9) (73.3) (84.2)
Net deferred tax benefits 10.0 28.2 34.4
Total other comprehensive income (loss) 6.1 (45.1) (49.8)
Total comprehensive income 1,587.3 1,208.9 1,173.2
Less: comprehensive income attributable to redeemable non-controlling interests 104.6 36.5 0.0
Comprehensive income attributable to T. Rowe Price Group 1,482.7 1,172.4 1,173.2
Variable interest entities [Member]      
Reclassification of (gains) and losses in accumulated other comprehensive income to non-operating investment income:      
Consolidated T. Rowe Price investment products—variable interest entities 66.4 (9.5) (4.9)
Reclassification losses (gains) recognized in non-operating investment income upon deconsolidation of certain T. Rowe Price investment products (0.1) (2.2) 5.8
Total currency translation adjustments 66.3 (11.7) 0.9
Equity method investments [Member]      
Reclassification of (gains) and losses in accumulated other comprehensive income to non-operating investment income:      
Total currency translation adjustments $ 2.6 $ (1.6) $ (8.1)
[1] See note 15 for a supplementary consolidating cash flow schedule.