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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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