Variable Interest Entities - Schedule of Assets and Liabilities that are VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets
Total assets	$ 677.0	$ 703.2
Liabilities
Total liabilities	593.0	616.1
Variable Interest Entity, Primary Beneficiary
Assets
Cash and cash equivalents	23.2	3.7
Other assets of consolidated Funds	24.9	1.6
Total assets	138.5	159.3
Liabilities
Securities sold short	7.8	20.4
Total liabilities	31.1	21.2
Variable Interest Entity, Primary Beneficiary
Assets
Investments	90.4	154.0
Liabilities
Other liabilities of consolidated Funds	$ 23.3	$ 0.8