Variable Interest Entities - Assets and Liabilities that are VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets
Total assets	$ 703.2	$ 611.4
Liabilities
Total liabilities	616.1	561.9
Variable Interest Entity, Primary Beneficiary
Assets
Investments	154.0	33.9
Other assets of consolidated Funds	5.3	1.3
Total assets	159.3	35.2
Liabilities
Liabilities of consolidated Funds	21.2	4.3
Total liabilities	$ 21.2	$ 4.3