Asset Management Fees - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues		$ 1,373.0	$ 723.0	$ 848.0
Total expenses		733.0	536.0	465.0
Related Party
Disaggregation of Revenue [Line Items]
Due from Affiliates			3.0
Management fee expense		$ 1.9	2.0	$ 2.4
Total revenues	$ 5.0
Total expenses	$ 3.0
Asset Management and Performance Allocation Fees | Related Party
Disaggregation of Revenue [Line Items]
Management and performance fees receivable			$ 10.0