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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | $ 5,824.4 |  | $ 5,824.4 |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 | [1] |  | $ 14.5 |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 |  | 2.3 | 0.0 |  |
Balances, As Adjusted |  |  | 5,838.9 |  |
Other comprehensive income (loss) |  |  |  | 7.4 |
Balances |  |  | 5,824.4 | 5,901.9 |
Net unrealized holding gains [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | 7.9 |  | 7.9 |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 |  |  | (7.9) |  |
Balances, As Adjusted |  |  | 0.0 |  |
Other comprehensive income 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 income taxes |  |  |  | 0.0 | $ 11.5
Other comprehensive income (loss) |  |  |  | 0.0 |
Balances |  |  | 7.9 | 0.0 |
Currency translation adjustments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | (11.5) |  | (11.5) |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 |  |  | 0.0 |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 |  |  | (2.3) |  |
Balances, As Adjusted |  |  | (13.8) |  |
Other comprehensive income before reclassifications and income taxes |  |  |  | 13.0 |
Reclassification adjustments recognized in non-operating income |  |  |  | (3.1) |
Other comprehensive income (loss), before taxes |  |  |  | 9.9 |
Net deferred tax income taxes |  |  |  | (2.5) | (0.8)
Other comprehensive income (loss) |  |  |  | 7.4 |
Balances |  |  | (11.5) | (6.4) |
Currency translation adjustments [Member] | Equity method investments [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | (30.6) |  | (30.6) |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 |  |  | 0.0 |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 |  |  | (6.4) |  |
Balances, As Adjusted |  |  | (37.0) |  |
Other comprehensive income before reclassifications and income taxes |  |  |  | 3.8 |
Reclassification adjustments recognized in non-operating income |  |  |  | 0.0 |
Other comprehensive income (loss), before taxes |  |  |  | 3.8 |
Net deferred tax income taxes |  |  |  | (0.8) |
Other comprehensive income (loss) |  |  |  | 3.0 |
Balances |  |  | (30.6) | (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] |  |  |  |  |
Balances |  | 19.1 |  | 19.1 |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 |  |  | 0.0 |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 |  |  | 4.1 |  |
Balances, As Adjusted |  |  | 23.2 |  |
Other comprehensive income before reclassifications and income taxes |  |  |  | 9.2 |
Reclassification adjustments recognized in non-operating income |  |  |  | (3.1) |
Other comprehensive income (loss), before taxes |  |  |  | 6.1 |
Net deferred tax income taxes |  |  |  | (1.7) |
Other comprehensive income (loss) |  |  |  | 4.4 |
Balances |  |  | 19.1 | 27.6 |
Total accumulated other comprehensive income (loss) [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | (3.6) |  | (3.6) |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 | [1] |  | (7.9) |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 |  |  | (2.3) |  |
Balances, As Adjusted |  |  | (13.8) |  |
Other comprehensive income before reclassifications and income taxes |  |  |  | 13.0 |
Reclassification adjustments recognized in non-operating income |  |  |  | (3.1) |
Other comprehensive income (loss), before taxes |  |  |  | 9.9 |
Net deferred tax income taxes |  |  |  | (2.5) | $ 10.7
Other comprehensive income (loss) |  |  |  | 7.4 |
Balances |  |  | (3.6) | (6.4) |
Retained earnings [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances |  | $ 4,932.9 |  | 4,932.9 |
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 | [1] |  | 22.4 |  |
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 |  |  | 2.3 |  |
Balances, As Adjusted |  |  | 4,957.6 |  |
Balances |  |  | $ 4,932.9 | $ 5,205.0 |
[1] | Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from the U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.

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