Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Contingency [Line Items]
Net deferred tax benefit	$ 68.0
Non-U.S. pre-tax income (loss)	450.0	$ (94.4)	$ (319.0)
Net income tax payments to US	42.7	$ 10.3	$ (0.1)
Ark | Ark
Income Tax Contingency [Line Items]
Net deferred tax benefit	51.0
HG Global/BAM - Segment | HG Global
Income Tax Contingency [Line Items]
Net deferred tax benefit	17.0
Domestic Tax Authority
Income Tax Contingency [Line Items]
Separate return limitation year operating loss carryforwards	0.7
Foreign Tax Authority
Income Tax Contingency [Line Items]
Tax credit carryforwards	$ 3.3