OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Deferred Tax Benefits (Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments	$ 2.8	$ (10.3)	$ 0.5
Total net deferred tax benefits	3.4	(11.8)	0.5
Reclassification adjustment recognized upon partial disposition of equity method investment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment recognized	0.0	(1.7)	0.0
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	0.6	0.2	0.0
Total net deferred tax benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total net deferred tax benefits	$ 3.4	$ (11.8)	$ 0.5

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