CONSOLIDATED INVESTMENT PRODUCTS - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Net interests in consolidated investment products	$ 521.9	$ 546.2
Debt of CIP	7,370.4	7,121.8
Variable interest entity, unfunded capital commitments	153.2	142.5
Fair Value, Inputs, Level 3 [Member]
Variable Interest Entity [Line Items]
Debt of CIP	565.0	353.7
De-consolidated
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss with respect to VIEs in which the Company is not primary beneficiary	$ 141.4	$ 122.9