Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Dec. 31, 2021	Mar. 31, 2022
Assets
Subtotal	$ 7,003.8	$ 7,112.3
Investments measured at net asset value	7,165.5
Liabilities
Loans payable of Consolidated Funds	5,811.0	5,682.1
Foreign currency forward contracts	0.7	1.3
Total	$ 5,811.7	$ 5,683.4
Maximum lag period for which the partnership investments in funds are valued	90 days	90 days
Revolving Credit Facility
Liabilities
Total	$ 79.0	$ 33.7
Equity securities
Assets
Investments	17.9
Bonds
Assets
Investments	599.5
Loans
Assets
Investments	5,898.1
Investments of Consolidated Funds
Assets
Investments	6,515.5
Investments in CLOs
Assets
Investments	361.1
Other investments
Assets
Investments	125.8
Foreign currency forward contracts
Assets
Foreign currency forward contracts	1.4
Level I
Assets
Subtotal	1.5	1.5
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Total	0.0	0.0
Level I \| Equity securities
Assets
Investments	0.0	0.0
Level I \| Bonds
Assets
Investments	0.0	0.0
Level I \| Loans
Assets
Investments	0.0	0.0
Level I \| Investments of Consolidated Funds
Assets
Investments	0.0	0.0
Level I \| Investments in CLOs
Assets
Investments	0.0	0.0
Level I \| Other investments
Assets
Investments	1.5	1.5
Level I \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.0	0.0
Level II
Assets
Subtotal	47.0	47.0
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Foreign currency forward contracts	0.7	1.3
Total	0.7	1.3
Level II \| Equity securities
Assets
Investments	0.0	0.0
Level II \| Bonds
Assets
Investments	0.0	0.0
Level II \| Loans
Assets
Investments	0.0	0.0
Level II \| Investments of Consolidated Funds
Assets
Investments	0.0	0.0
Level II \| Investments in CLOs
Assets
Investments	0.0	0.0
Level II \| Other investments
Assets
Investments	45.6	44.9
Level II \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	1.4	2.1
Level III
Assets
Subtotal	6,955.3	6,825.4
Liabilities
Loans payable of Consolidated Funds	5,811.0	5,682.1
Foreign currency forward contracts	0.0	0.0
Total	5,811.0	5,682.1
Level III \| Equity securities
Assets
Investments	17.9	11.3
Investments measured at net asset value		54.9
Level III \| Bonds
Assets
Investments	599.5	565.2
Level III \| Loans
Assets
Investments	5,898.1	5,612.5
Level III \| Investments of Consolidated Funds
Assets
Investments	6,515.5	6,189.0
Subtotal	6,515.5	6,189.0
Level III \| Investments in CLOs
Assets
Investments	361.1	560.4
Level III \| Other investments
Assets
Investments	78.7	76.0
Level III \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.0	0.0
Fair Value Measured at NAV
Assets
Investments measured at net asset value	161.7	238.4
Fair Value Measured at NAV \| Consolidated VIEs
Assets
Investments measured at net asset value	145.5	223.6
Fair Value, Inputs, Level 1, 2 and 3
Assets
Subtotal		6,873.9
Fair Value, Inputs, Level 1, 2 and 3 \| Equity securities
Assets
Investments		11.3
Fair Value, Inputs, Level 1, 2 and 3 \| Bonds
Assets
Investments		565.2
Fair Value, Inputs, Level 1, 2 and 3 \| Loans
Assets
Investments		5,612.5
Fair Value, Inputs, Level 1, 2 and 3 \| Investments of Consolidated Funds
Assets
Investments		6,189.0
Fair Value, Inputs, Level 1, 2 and 3 \| Investments in CLOs
Assets
Investments		560.4
Investments measured at net asset value	$ 54.9
Fair Value, Inputs, Level 1, 2 and 3 \| Other investments
Assets
Investments		122.4
Fair Value, Inputs, Level 1, 2 and 3 \| Foreign currency forward contracts
Assets
Foreign currency forward contracts		$ 2.1

Maximum lag period for which the partnership investments in funds are valued.

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

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