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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Currency translation adjustments | $ 4.2 | $ 2.8 | $ (10.3)
Total net deferred tax benefits | 5.0 | 3.4 | (11.8)
Reclassification adjustment recognized upon partial disposition of equity method investment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustment recognized | 0.0 | 0.0 | (1.7)
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 | 0.8 | 0.6 | 0.2
Total net deferred tax benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total net deferred tax benefits | $ 5.0 | $ 3.4 | $ (11.8)

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