Significant Transactions - BAM (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jul. 01, 2024	Dec. 31, 2023
Other Significant Transactions [Line Items]
Unrealized loss on deconsolidation of BAM	$ 114.5		$ 114.5	$ 0.0
Operating Segments | Financial Guarantee (HG Global)
Other Significant Transactions [Line Items]
Notes receivable, fair value disclosure	411.1		411.1		$ 387.4	$ 0.0
Unrealized loss on deconsolidation of BAM	$ 114.5	$ 0.0	$ 114.5	$ 0.0