Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Assets
Subtotal	$ 7,577.8	$ 7,165.5
Liabilities
Loans payable of Consolidated Funds	5,491.6	5,811.0
Total Liabilities	$ 5,494.8	$ 5,811.7
Maximum lag period for which the partnership investments in funds are valued	90 days	90 days
Senior Notes
Liabilities
Total Liabilities	$ 235.6
Revolving Credit Facililty
Liabilities
Total Liabilities	178.0	$ 79.0
Equity securities
Assets
Investments of consolidated funds	430.6	17.9
Equity securities \| Variable Interest Entity, Primary Beneficiary
Assets
Investments measured at net asset value	377.4
Bonds
Assets
Investments of consolidated funds	594.9	599.5
Loans
Assets
Investments of consolidated funds	5,352.9	5,898.1
Investments of Consolidated Funds
Assets
Investments of consolidated funds	6,378.4	6,515.5
Investments in CLOs
Assets
Investments of consolidated funds	526.1	361.1
Foreign currency forward contracts
Assets
Foreign currency forward contracts	2.2	1.4
Liabilities
Foreign currency forward contracts	3.2	0.7
Level I
Assets
Subtotal	1.6	1.5
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Total Liabilities	0.0	0.0
Level I \| Equity securities
Assets
Investments of consolidated funds	0.0	0.0
Level I \| Bonds
Assets
Investments of consolidated funds	0.0	0.0
Level I \| Loans
Assets
Investments of consolidated funds	0.0	0.0
Level I \| Investments of Consolidated Funds
Assets
Investments of consolidated funds	0.0	0.0
Level I \| Investments in CLOs
Assets
Investments of consolidated funds	0.0	0.0
Level I \| Other
Assets
Investments of consolidated funds	1.6	1.5
Level I \| Corporate treasury investments:
Assets
Subtotal	0.0
Level I \| Commercial paper and other
Assets
Subtotal	0.0
Level I \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.0	0.0
Liabilities
Foreign currency forward contracts	0.0	0.0
Level II
Assets
Subtotal	63.8	47.0
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Total Liabilities	3.2	0.7
Level II \| Equity securities
Assets
Investments of consolidated funds	0.0	0.0
Level II \| Bonds
Assets
Investments of consolidated funds	0.0	0.0
Level II \| Loans
Assets
Investments of consolidated funds	0.0	0.0
Level II \| Investments of Consolidated Funds
Assets
Investments of consolidated funds	0.0	0.0
Level II \| Investments in CLOs
Assets
Investments of consolidated funds	0.0	0.0
Level II \| Other
Assets
Investments of consolidated funds	41.6	45.6
Level II \| Corporate treasury investments:
Assets
Subtotal	20.0
Level II \| Commercial paper and other
Assets
Subtotal	20.0
Level II \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	2.2	1.4
Liabilities
Foreign currency forward contracts	3.2	0.7
Level III
Assets
Subtotal	6,983.9	6,955.3
Liabilities
Loans payable of Consolidated Funds	5,491.6	5,811.0
Total Liabilities	5,491.6	5,811.0
Level III \| Equity securities
Assets
Investments of consolidated funds	430.6	17.9
Subtotal	64.0
Investments measured at net asset value	58.2
Level III \| Bonds
Assets
Investments of consolidated funds	594.9	599.5
Subtotal	594.9	599.5
Level III \| Loans
Assets
Investments of consolidated funds	5,352.9	5,898.1
Subtotal	5,043.4	5,766.0
Level III \| Investments of Consolidated Funds
Assets
Investments of consolidated funds	6,378.4	6,515.5
Subtotal	6,378.4	6,515.5
Level III \| Investments in CLOs
Assets
Investments of consolidated funds	526.1	361.1
Level III \| Other
Assets
Investments of consolidated funds	79.4	78.7
Level III \| Corporate treasury investments:
Assets
Subtotal	0.0
Level III \| Commercial paper and other
Assets
Subtotal	0.0
Level III \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.0	0.0
Liabilities
Foreign currency forward contracts	0.0	0.0
Fair Value, Inputs, Level 1, 2 and 3
Assets
Subtotal	7,049.3	7,003.8
Fair Value, Inputs, Level 1, 2 and 3 \| Investments in CLOs
Assets
Investments measured at net asset value		54.9
Fair Value, Inputs, Level 1, 2 and 3 \| Other
Assets
Investments of consolidated funds	122.6	125.8
Fair Value, Inputs, Level 1, 2 and 3 \| Corporate treasury investments:
Assets
Subtotal	20.0
Fair Value, Inputs, Level 1, 2 and 3 \| Commercial paper and other
Assets
Subtotal	20.0
Fair Value Measured at NAV
Assets
Investments of consolidated funds	516.0
Subtotal	$ 528.5
Investments measured at net asset value		161.7
Liabilities
Maximum lag period for which the partnership investments in funds are valued	90 days
Fair Value Measured at NAV \| Variable Interest Entity, Primary Beneficiary
Assets
Investments measured at net asset value		$ 145.5

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

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