CONSOLIDATED INVESTMENT PRODUCTS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) entity	Dec. 31, 2020 USD ($) entity
Variable Interest Entity [Line Items]
Number of deconsolidated VIEs	7	15
Number of deconsolidated VOEs	6	11
Net impact on Consolidated Statements of Income | $	$ 0.0	$ 0.0
LIBOR spread on bank loan investments (percent)	9.25%
Percentage of collateral in default (percent)	0.52%	1.17%
Issued notes weighted average maturity period	11 years
Pre-defined spreads on variable rate notes - minimum (percent)	0.40%
Pre-defined spreads on variable rate notes - maximum (percent)	8.68%
Senior secured bank loans and bonds
Variable Interest Entity [Line Items]
Excess of unpaid principal balances over fair value of senior secured bank loans and bonds | $	$ 60.4	$ 208.6
Deconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss with respect to VIEs | $	$ 134.1	$ 152.0
Consolidated VIEs
Variable Interest Entity [Line Items]
Number of consolidated VIEs	10	4
Number of consolidated VOEs	6	2