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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | $ 5,824.4 | $ 5,008.6 | $ 4,762.0 |
Balances, Adjusted |  |  | 5,838.9 |  | $ 4,765.9
Other comprehensive income (loss) |  | (28.2) | (15.1) | (42.6) |
Balances |  | 6,124.3 | 5,824.4 | 5,008.6 |
Accounting standards update 2016-01 [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  | 14.5 |  |
Net unrealized holding gains [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | 7.9 | 52.2 | 120.3 |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (32.0)
Balances, Adjusted |  |  | 0.0 |  | 88.3
Other comprehensive income (loss) before reclassifications and income taxes |  | 0.0 | 37.4 | (7.0) |
Reclassification adjustments recognized in non-operating income |  | 0.0 | (110.2) | (53.0) |
Other comprehensive income (loss), before taxes |  | 0.0 | (72.8) | (60.0) |
Net deferred tax benefits (income taxes) |  | 0.0 | 28.5 | 23.9 |
Other comprehensive income (loss) |  | 0.0 | (44.3) | (36.1) |
Balances |  | 0.0 | 7.9 | 52.2 |
Net unrealized holding gains [Member] | Accounting standards update 2016-01 [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | (7.9) |  |
Net unrealized holding gains [Member] | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | 0.0 |  |
Currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | (11.5) | (40.7) | (33.7) |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (0.5)
Balances, Adjusted |  |  | (13.8) |  | (34.2)
Other comprehensive income (loss) before reclassifications and income taxes |  | (33.8) | 47.8 | (8.6) |
Reclassification adjustments recognized in non-operating income |  | (3.6) | (0.1) | (2.2) |
Other comprehensive income (loss), before taxes |  | (37.4) | 47.7 | (10.8) |
Net deferred tax benefits (income taxes) |  | 9.2 | (18.5) | 4.3 |
Other comprehensive income (loss) |  | (28.2) | 29.2 | (6.5) |
Balances |  | (42.0) | (11.5) | (40.7) |
Currency translation adjustments [Member] | Accounting standards update 2016-01 [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | 0.0 |  |
Currency translation adjustments [Member] | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | (2.3) |  |
Currency translation adjustments [Member] | Equity method investments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | (30.6) | (32.3) | (30.9) |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (0.5)
Balances, Adjusted |  |  | (37.0) |  | (31.4)
Other comprehensive income (loss) before reclassifications and income taxes |  | (15.2) | 2.6 | (1.6) |
Reclassification adjustments recognized in non-operating income |  | 0.0 | 0.0 | 0.0 |
Other comprehensive income (loss), before taxes |  | (15.2) | 2.6 | (1.6) |
Net deferred tax benefits (income taxes) |  | 3.4 | (0.9) | 0.7 |
Other comprehensive income (loss) |  | (11.8) | 1.7 | (0.9) |
Balances |  | (48.8) | (30.6) | (32.3) |
Currency translation adjustments [Member] | Equity method investments [Member] | Accounting standards update 2016-01 [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | 0.0 |  |
Currency translation adjustments [Member] | Equity method investments [Member] | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | (6.4) |  |
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | 19.1 | (8.4) | (2.8) |
Cumulative effect of adopting new accounting guidance |  |  |  |  | 0.0
Balances, Adjusted |  |  | 23.2 |  | (2.8)
Other comprehensive income (loss) before reclassifications and income taxes |  | (18.6) | 45.2 | (7.0) |
Reclassification adjustments recognized in non-operating income |  | (3.6) | (0.1) | (2.2) |
Other comprehensive income (loss), before taxes |  | (22.2) | 45.1 | (9.2) |
Net deferred tax benefits (income taxes) |  | 5.8 | (17.6) | 3.6 |
Other comprehensive income (loss) |  | (16.4) | 27.5 | (5.6) |
Balances |  | 6.8 | 19.1 | (8.4) |
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] | Accounting standards update 2016-01 [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | 0.0 |  |
Currency translation adjustments [Member] | Consolidated T. Rowe Price investment products - variable interest entities [Member] | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | 4.1 |  |
Total accumulated other comprehensive income [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances | [2] | (3.6) | 11.5 | 86.6 |
Cumulative effect of adopting new accounting guidance |  |  |  |  | (32.5)
Balances, Adjusted | [2] |  | (13.8) |  | 54.1
Other comprehensive income (loss) before reclassifications and income taxes |  | (33.8) | 85.2 | (15.6) |
Reclassification adjustments recognized in non-operating income |  | (3.6) | (110.3) | (55.2) |
Other comprehensive income (loss), before taxes |  | (37.4) | (25.1) | (70.8) |
Net deferred tax benefits (income taxes) |  | 9.2 | 10.0 | 28.2 |
Other comprehensive income (loss) | [2] | (28.2) | (15.1) | (42.6) |
Balances | [2] | (42.0) | (3.6) | 11.5 |
Total accumulated other comprehensive income [Member] | Accounting standards update 2016-01 [Member] |  |  |  |  |
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 [Member] | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [2] |  | (2.3) |  |
Total accumulated other comprehensive income [Member] | Accounting standards update 2018-02, available for sale securities [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  | 1.7 |  |
Retained earnings [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | 4,932.9 | 4,293.6 | 3,970.7 |
Balances, Adjusted |  |  | 4,957.6 |  | $ 3,994.2
Balances |  | $ 5,464.1 | 4,932.9 | $ 4,293.6 |
Retained earnings [Member] | Accounting standards update 2016-01 [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  | 22.4 |  |
Retained earnings [Member] | Accounting standards update 2018-02, currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance |  |  | 2.3 |  |
Retained earnings [Member] | Accounting standards update 2018-02, available for sale securities [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  | $ (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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