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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE LOSS. (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning Balance |  | $ 6,579.1 | $ 6,114.6 | $ 6,124.3 | $ 5,824.4 |
Other comprehensive income (loss) |  | (10.2) | (7.3) | (6.7) | (17.2) |
Ending Balance |  | 6,839.8 | 6,460.5 | 6,839.8 | 6,460.5 |
Currency translation adjustments [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning Balance |  | (38.5) | (23.7) | (42.0) | (13.8) |
Other comprehensive income (loss) before reclassifications and income taxes |  | (13.6) | (9.6) | (9.0) | (19.4) |
Reclassification adjustments recognized in non-operating income |  | 0.1 | 0.0 | (0.1) | (3.6) |
Other comprehensive income (loss), before taxes |  | (13.5) | (9.6) | (9.1) | (23.0) |
Net deferred tax benefits (income taxes) |  | 3.4 | 2.3 | 2.5 | 5.8 |
Other comprehensive income (loss) |  | (10.1) | (7.3) | (6.6) | (17.2) |
Ending Balance |  | (48.6) | (31.0) | (48.6) | (31.0) |
Currency translation adjustments [Member] | Equity method investments [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning Balance |  | (43.8) | (36.6) | (48.8) | (37.0) |
Other comprehensive income (loss) before reclassifications and income taxes |  | (1.0) | (7.1) | 5.4 | (6.6) |
Reclassification adjustments recognized in non-operating income |  | 0.0 | 0.0 | 0.0 | 0.0 |
Other comprehensive income (loss), before taxes |  | (1.0) | (7.1) | 5.4 | (6.6) |
Net deferred tax benefits (income taxes) |  | 0.3 | 1.6 | (1.1) | 1.5 |
Other comprehensive income (loss) |  | (0.7) | (5.5) | 4.3 | (5.1) |
Ending Balance |  | (44.5) | (42.1) | (44.5) | (42.1) |
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning Balance |  | 5.3 | 12.9 | 6.8 | 23.2 |
Other comprehensive income (loss) before reclassifications and income taxes |  | (12.6) | (2.5) | (14.4) | (12.8) |
Reclassification adjustments recognized in non-operating income |  | 0.1 | 0.0 | (0.1) | (3.6) |
Other comprehensive income (loss), before taxes |  | (12.5) | (2.5) | (14.5) | (16.4) |
Net deferred tax benefits (income taxes) |  | 3.1 | 0.7 | 3.6 | 4.3 |
Other comprehensive income (loss) |  | (9.4) | (1.8) | (10.9) | (12.1) |
Ending Balance |  | (4.1) | 11.1 | (4.1) | 11.1 |
Retained earnings [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning Balance |  | 5,915.9 | 5,435.1 | 5,464.1 | 4,932.9 |
Ending Balance |  | 6,187.0 | 5,788.5 | 6,187.0 | 5,788.5 |
Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning Balance | [1] | (38.5) | (23.7) | (42.0) | (3.6) |
Other comprehensive income (loss) | [1] | (10.2) | (7.3) | (6.7) | (17.2) |
Ending Balance | [1] | $ (48.7) | $ (31.0) | $ (48.7) | $ (31.0) |
Accounting standards update 2016-01 [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [2] |  |  |  |  | $ 14.5
Accounting standards update 2016-01 [Member] | Retained earnings [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [2] |  |  |  |  | 22.4
Accounting standards update 2016-01 [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1],[2] |  |  |  |  | (7.9)
Accounting standards update 2016-01 [Member] | Reclassification out of accumulated other comprehensive income [Member] | Retained earnings [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | 7.9
Accounting standards update 2016-01 [Member] | Reclassification out of accumulated other comprehensive income [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | (7.9)
Accounting standards update 2018-02, available for sale securities [Member] | Retained earnings [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | 1.7
Accounting standards update 2018-02, available for sale securities [Member] | Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  |  |  |  |  | $ (1.7)
[1] | Accumulated other comprehensive income.
[2] | Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.

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