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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances |  | $ 6,124.3 | $ 5,824.4 | $ 5,008.6 |
Balances, adjusted |  |  |  |  | $ 5,838.9
Other comprehensive income (loss) |  | (1.0) | (28.2) | (15.1) |
Ending balances |  | 7,102.1 | 6,124.3 | 5,824.4 |
Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  |  |  | 14.5
Net unrealized holding gains |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances |  | 0.0 | 7.9 | 52.2 |
Balances, adjusted |  |  |  |  | 0.0
Other comprehensive income (loss) before reclassifications and income taxes |  | 0.0 | 0.0 | 37.4 |
Reclassification adjustments recognized in non-operating income |  | 0.0 | 0.0 | (110.2) |
Other comprehensive income (loss), before taxes |  | 0.0 | 0.0 | (72.8) |
Net deferred tax benefits (income taxes) |  | 0.0 | 0.0 | 28.5 |
Other comprehensive income (loss) |  | 0.0 | 0.0 | (44.3) |
Ending balances |  | 0.0 | 0.0 | 7.9 |
Net unrealized holding gains | Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (7.9)
Net unrealized holding gains | Accounting standards update 2018-02, currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | 0.0
Currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances |  | (42.0) | (11.5) | (40.7) |
Balances, adjusted |  |  |  |  | (13.8)
Other comprehensive income (loss) before reclassifications and income taxes |  | (1.4) | (33.8) | 47.8 |
Reclassification adjustments recognized in non-operating income |  | (0.1) | (3.6) | (0.1) |
Other comprehensive income (loss), before taxes |  | (1.5) | (37.4) | 47.7 |
Net deferred tax benefits (income taxes) |  | 0.5 | 9.2 | (18.5) |
Other comprehensive income (loss) |  | (1.0) | (28.2) | 29.2 |
Ending balances |  | (43.0) | (42.0) | (11.5) |
Currency translation adjustments | Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | 0.0
Currency translation adjustments | Accounting standards update 2018-02, currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (2.3)
Currency translation adjustments | Equity method investments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances |  | (48.8) | (30.6) | (32.3) |
Balances, adjusted |  |  |  |  | (37.0)
Other comprehensive income (loss) before reclassifications and income taxes |  | 2.4 | (15.2) | 2.6 |
Reclassification adjustments recognized in non-operating income |  | 0.0 | 0.0 | 0.0 |
Other comprehensive income (loss), before taxes |  | 2.4 | (15.2) | 2.6 |
Net deferred tax benefits (income taxes) |  | (0.5) | 3.4 | (0.9) |
Other comprehensive income (loss) |  | 1.9 | (11.8) | 1.7 |
Ending balances |  | (46.9) | (48.8) | (30.6) |
Currency translation adjustments | Equity method investments | Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | 0.0
Currency translation adjustments | Equity method investments | Accounting standards update 2018-02, currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (6.4)
Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances |  | 6.8 | 19.1 | (8.4) |
Balances, adjusted |  |  |  |  | 23.2
Other comprehensive income (loss) before reclassifications and income taxes |  | (3.8) | (18.6) | 45.2 |
Reclassification adjustments recognized in non-operating income |  | (0.1) | (3.6) | (0.1) |
Other comprehensive income (loss), before taxes |  | (3.9) | (22.2) | 45.1 |
Net deferred tax benefits (income taxes) |  | 1.0 | 5.8 | (17.6) |
Other comprehensive income (loss) |  | (2.9) | (16.4) | 27.5 |
Ending balances |  | 3.9 | 6.8 | 19.1 |
Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities | Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | 0.0
Currency translation adjustments | Consolidated T. Rowe Price investment products - variable interest entities | Accounting standards update 2018-02, currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  |  | 4.1
Total accumulated other comprehensive income |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances | [2] | (42.0) | (3.6) | 11.5 |
Balances, adjusted | [2] |  |  |  | (13.8)
Other comprehensive income (loss) before reclassifications and income taxes |  | (1.4) | (33.8) | 85.2 |
Reclassification adjustments recognized in non-operating income |  | (0.1) | (3.6) | (110.3) |
Other comprehensive income (loss), before taxes |  | (1.5) | (37.4) | (25.1) |
Net deferred tax benefits (income taxes) |  | 0.5 | 9.2 | 10.0 |
Other comprehensive income (loss) | [2] | (1.0) | (28.2) | (15.1) |
Ending balances | [2] | (43.0) | (42.0) | (3.6) |
Total accumulated other comprehensive income | Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1],[2] |  |  |  | (7.9)
Total accumulated other comprehensive income | Accounting standards update 2018-02, currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [2] |  |  |  | (2.3)
Total accumulated other comprehensive income | Accounting standards update 2018-02, available for sale securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  |  | (1.7) |
Retained earnings |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balances |  | 5,464.1 | 4,932.9 | 4,293.6 |
Balances, adjusted |  |  |  |  | 4,957.6
Ending balances |  | $ 6,443.5 | $ 5,464.1 | 4,932.9 |
Retained earnings | Accounting standards update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  |  |  | 22.4
Retained earnings | Accounting standards update 2018-02, currency translation adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [2] |  |  |  | $ 2.3
Retained earnings | Accounting standards update 2018-02, available for sale securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  |  | $ 1.7 |
[1] | 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.
[2] | Accumulated other comprehensive income

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