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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Deferred Tax Benefits (Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Currency translation adjustments | $ (2.0) | $ 4.2 | $ 2.8
Total net deferred tax benefits | (1.9) | 5.0 | 3.4
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of T. Rowe Price investment product |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustment recognized | 0.1 | 0.8 | 0.6
Total net deferred tax benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total net deferred tax benefits | $ (1.9) | $ 5.0 | $ 3.4

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