Variable Interest Entities - Schedule of Assets and Liabilities of Funds that are VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Total assets	$ 677.3	$ 703.2
Liabilities
Total liabilities	584.8	616.1
VIEs, Consolidated Funds
Assets
Investments	155.8	154.0
Other assets of consolidated Funds	8.4	5.3
Total assets	164.2	159.3
Liabilities
Liabilities of consolidated Funds	21.6	21.2
Total liabilities	$ 21.6	$ 21.2