OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Deferred Tax Benefits (Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total net deferred tax benefits (income taxes)	$ (1.4)	$ 3.7	$ (1.9)
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments	2.8	(3.7)	2.0
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of investment products	1.4	0.0	0.1
Total net deferred tax benefits (income taxes)	$ (1.4)	$ 3.7	$ (1.9)