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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Deferred Tax Benefits (Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
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