Income Taxes - Significant Components of Deferred Tax Assets and Liabilities and Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Investment in partnerships	$ 73.4	$ 63.6
Employee compensation	1.3	1.6
Other	2.6	2.1
Cash flow hedge	1.6	2.6
Total deferred tax assets	78.9	69.9
Valuation allowance	0.0	0.0
Deferred tax assets, net of valuation allowance	78.9	69.9
Deferred tax liabilities:
Right of use assets	0.1	0.1
Investments	0.5	0.1
Total deferred tax liabilities	0.6	0.2
Net deferred tax assets	$ 78.3	$ 69.7