Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Assets
Subtotal	$ 7,165.5	$ 6,644.8
Liabilities
Loans payable of Consolidated Funds	5,811.0	5,563.0
Total Liabilities	$ 5,811.7	$ 5,563.4
Maximum lag period for which the partnership investments in funds are valued	90 days	90 days
Revolving Credit Facililty
Liabilities
Total Liabilities	$ 79.0
Equity securities
Assets
Investments of consolidated funds	17.9	$ 9.4
Bonds
Assets
Investments of consolidated funds	599.5	550.4
Loans
Assets
Investments of consolidated funds	5,898.1	5,497.1
Investments of Consolidated Funds
Assets
Investments of consolidated funds	6,515.5	6,056.9
Investments in CLOs and other
Assets
Investments of consolidated funds	486.9	570.8
Foreign currency forward contracts
Assets
Foreign currency forward contracts	1.4	0.7
Liabilities
Foreign currency forward contracts	0.7	0.4
Level I
Assets
Subtotal	1.5	0.0
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 and other
Assets
Investments of consolidated funds	1.5	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	47.0	0.7
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Total Liabilities	0.7	0.4
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 and other
Assets
Investments of consolidated funds	45.6	0.0
Level II \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	1.4	0.7
Liabilities
Foreign currency forward contracts	0.7	0.4
Level III
Assets
Subtotal	6,955.3	6,627.7
Liabilities
Loans payable of Consolidated Funds	5,811.0	5,563.0
Total Liabilities	5,811.0	5,563.0
Level III \| Equity securities
Assets
Investments of consolidated funds	17.9	9.4
Level III \| Bonds
Assets
Investments of consolidated funds	599.5	550.4
Subtotal	599.5	550.4
Level III \| Loans
Assets
Investments of consolidated funds	5,898.1	5,497.1
Subtotal	5,766.0	5,497.1
Level III \| Investments of Consolidated Funds
Assets
Investments of consolidated funds	6,515.5	6,056.9
Subtotal	6,515.5	6,056.9
Level III \| Investments in CLOs and other
Assets
Investments of consolidated funds	439.8	570.8
Subtotal	6,955.3	6,627.7
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	7,003.8	6,628.4
Fair Value, Inputs, Level 1, 2 and 3 \| Investments in CLOs and other
Assets
Investments measured at net asset value	54.9
Fair Value Measured at NAV
Assets
Investments of consolidated funds	145.5
Subtotal	$ 161.7
Investments measured at net asset value		$ 16.4
Liabilities
Maximum lag period for which the partnership investments in funds are valued	90 days

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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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