Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fund Management Fees
Period of time for which management fees will be received by partners from the initial closing date	10 years
Subsequent period in which management fees are recognized after these fees are called semi-annually fees in advance	6 months
Percentage of management fees for CLOs on the total par amount of assets in the fund	1.00%
Management fee receivables	$ 236.9	$ 164.5
Transaction and advisory fees	$ 106.2	90.7	$ 50.8
Incentive Fees
Performance fees allocation percentage to partnership (percent)	20.00%
Accrued giveback obligations	$ 40.9	30.2
Interest Income
Interest income from investments	$ 282.3	$ 231.3	$ 211.6
Minimum
Fund Management Fees
Percentage of management fees earned	1.00%
Extension period for fund closing	1 year
Percentage of management fees for CLOs on the total par amount of assets in the fund	0.40%
Period of management fees related to Collateralized Loan Obligation	5 years
Percentage of management fees for business development companies	1.00%
Percentage of management fees from funds of funds following the expiration of the weighted average investment period	0.25%
Incentive Fees
Percentage of allocation based performance fees related to fund of funds vehicles (percent)	2.00%
Percent of preferred returns (percent)	7.00%
Minimum | Private Equity And Real Estate Fund
Fund Management Fees
Percentage of management fees from funds of funds during the commitment fee period	0.25%
Maximum
Fund Management Fees
Percentage of management fees earned	2.00%
Extension period for fund closing	2 years
Percentage of management fees for CLOs on the total par amount of assets in the fund	0.50%
Period of management fees related to Collateralized Loan Obligation	10 years
Percentage of management fees for business development companies	1.50%
Percentage of management fees from funds of funds following the expiration of the weighted average investment period	1.00%
Incentive Fees
Percentage of allocation based performance fees related to fund of funds vehicles (percent)	12.50%
Percent of preferred returns (percent)	9.00%
Maximum | Private Equity And Real Estate Fund
Fund Management Fees
Percentage of management fees from funds of funds during the commitment fee period	1.00%