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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | $ 6,124.3 | $ 5,824.4 |
Balances, As Adjusted |  |  |  | $ 5,838.9
Other comprehensive income (loss) |  | 0.4 | 7.4 |
Ending Balance |  | 6,311.0 | 5,901.9 |
Net unrealized holding gains [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | 7.9 |
Balances, As Adjusted |  |  |  | 0.0
Other comprehensive income (loss) before reclassifications and income taxes |  |  | 0.0 |
Reclassification adjustments recognized in non-operating income |  |  | 0.0 |
Other comprehensive income (loss), before taxes |  |  | 0.0 |
Net deferred tax benefits (income taxes) |  |  | 0.0 |
Other comprehensive income (loss) |  |  | 0.0 |
Ending Balance |  |  | 0.0 |
Currency translation adjustments [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (42.0) | (11.5) |
Balances, As Adjusted |  |  |  | (13.8)
Other comprehensive income (loss) before reclassifications and income taxes |  | 0.4 | 13.0 |
Reclassification adjustments recognized in non-operating income |  | (0.1) | (3.1) |
Other comprehensive income (loss), before taxes |  | 0.3 | 9.9 |
Net deferred tax benefits (income taxes) |  | 0.1 | (2.5) |
Other comprehensive income (loss) |  | 0.4 | 7.4 |
Ending Balance |  | (41.6) | (6.4) |
Currency translation adjustments [Member] | Equity method investments [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (48.8) | (30.6) |
Balances, As Adjusted |  |  |  | (37.0)
Other comprehensive income (loss) before reclassifications and income taxes |  | 4.9 | 3.8 |
Reclassification adjustments recognized in non-operating income |  | 0.0 | 0.0 |
Other comprehensive income (loss), before taxes |  | 4.9 | 3.8 |
Net deferred tax benefits (income taxes) |  | (1.1) | (0.8) |
Other comprehensive income (loss) |  | 3.8 | 3.0 |
Ending Balance |  | (45.0) | (34.0) |
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 |  | 6.8 | 19.1 |
Balances, As Adjusted |  |  |  | 23.2
Other comprehensive income (loss) before reclassifications and income taxes |  | (4.5) | 9.2 |
Reclassification adjustments recognized in non-operating income |  | (0.1) | (3.1) |
Other comprehensive income (loss), before taxes |  | (4.6) | 6.1 |
Net deferred tax benefits (income taxes) |  | 1.2 | (1.7) |
Other comprehensive income (loss) |  | (3.4) | 4.4 |
Ending Balance |  | 3.4 | 27.6 |
Total accumulated other comprehensive income (loss) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | [1] | (42.0) | (3.6) |
Balances, As Adjusted | [1] |  |  | (13.8)
Other comprehensive income (loss) before reclassifications and income taxes |  | 0.4 | 13.0 |
Reclassification adjustments recognized in non-operating income |  | (0.1) | (3.1) |
Other comprehensive income (loss), before taxes |  | 0.3 | 9.9 |
Net deferred tax benefits (income taxes) |  | 0.1 | (2.5) |
Other comprehensive income (loss) | [1] | 0.4 | 7.4 |
Ending Balance | [1] | (41.6) | (6.4) |
Retained earnings [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | 5,464.1 | 4,932.9 |
Balances, As Adjusted |  |  |  | 4,957.6
Ending Balance |  | $ 5,650.8 | $ 5,205.0 |
Accounting standards update 2016-01 [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | 14.5
Accounting standards update 2016-01 [Member] | Net unrealized holding gains [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | (7.9)
Accounting standards update 2016-01 [Member] | Currency translation adjustments [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | 0.0
Accounting standards update 2016-01 [Member] | Currency translation adjustments [Member] | Equity method investments [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | 0.0
Accounting standards update 2016-01 [Member] | Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | 0.0
Accounting standards update 2016-01 [Member] | Total accumulated other comprehensive income (loss) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 | [1],[2] |  |  | (7.9)
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 on January 1, 2018 | [2] |  |  | 22.4
Accounting standards update 2018-02, currency translation adjustments [Member] | Net unrealized holding gains [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | 0.0
Accounting standards update 2018-02, currency translation adjustments [Member] | Currency translation adjustments [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | (2.3)
Accounting standards update 2018-02, currency translation adjustments [Member] | Currency translation adjustments [Member] | Equity method investments [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | (6.4)
Accounting standards update 2018-02, currency translation adjustments [Member] | Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | 4.1
Accounting standards update 2018-02, currency translation adjustments [Member] | Total accumulated other comprehensive income (loss) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 | [1] |  |  | (2.3)
Accounting standards update 2018-02, currency translation adjustments [Member] | Retained earnings [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance on January 1, 2018 |  |  |  | $ 2.3
[1] | Accumulated other comprehensive income.
[2] | ncludes the reclassification of $1.7 million of stranded income taxes on certain 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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