Variable Interest Entities - Schedule of Assets and Liabilities of Funds that are VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets
Total assets	$ 672.3	$ 703.2
Liabilities
Total liabilities	585.4	616.1
VIEs, Consolidated Funds
Assets
Investments	170.5	154.0
Other assets of consolidated Funds	10.3	5.3
Total assets	180.8	159.3
Liabilities
Liabilities of consolidated Funds	27.1	21.2
Total liabilities	$ 27.1	$ 21.2