Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Total	$ 5,503.6	$ 5,784.7
Liabilities
Loans payable of Consolidated Funds	4,685.2	4,840.1
Total Liabilities	4,685.5	4,841.5
Equity securities
Assets
Assets	19.4
Bonds
Assets
Assets	574.1	690.1
Loans
Assets
Assets	4,413.8	4,596.5
Investments of Consolidated Funds:
Assets
Assets	5,007.3	5,286.6
Investments in CLOs and other
Assets
Assets	496.2	446.4
Bonds
Assets
Assets		29.2
Commercial paper and other
Assets
Assets		22.5
Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.1
Liabilities
Foreign currency forward contracts	0.3	1.4
Level I
Assets
Total	0.0	0.0
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Total Liabilities	0.0	0.0
Level I \| Equity securities
Assets
Assets	0.0
Level I \| Bonds
Assets
Assets	0.0	0.0
Level I \| Loans
Assets
Assets	0.0	0.0
Level I \| Investments of Consolidated Funds:
Assets
Assets	0.0	0.0
Level I \| Investments in CLOs and other
Assets
Assets	0.0	0.0
Level I \| Bonds
Assets
Assets		0.0
Level I \| Commercial paper and other
Assets
Assets		0.0
Level I \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.0
Liabilities
Foreign currency forward contracts	0.0	0.0
Level II
Assets
Total	0.1	51.7
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Total Liabilities	0.3	1.4
Level II \| Equity securities
Assets
Assets	0.0
Level II \| Bonds
Assets
Assets	0.0	0.0
Level II \| Loans
Assets
Assets	0.0	0.0
Level II \| Investments of Consolidated Funds:
Assets
Assets	0.0	0.0
Level II \| Investments in CLOs and other
Assets
Assets	0.0	0.0
Level II \| Bonds
Assets
Assets		29.2
Level II \| Commercial paper and other
Assets
Assets		22.5
Level II \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.1
Liabilities
Foreign currency forward contracts	0.3	1.4
Level III
Assets
Total	5,503.5	5,733.0
Liabilities
Loans payable of Consolidated Funds	4,685.2	4,840.1
Total Liabilities	4,685.2	4,840.1
Level III \| Equity securities
Assets
Assets	19.4
Level III \| Bonds
Assets
Assets	574.1	690.1
Level III \| Loans
Assets
Assets	4,413.8	4,596.5
Level III \| Investments of Consolidated Funds:
Assets
Assets	5,007.3	5,286.6
Total	5,007.3	5,286.6
Level III \| Investments in CLOs and other
Assets
Assets	496.2	446.4
Total	5,503.5	5,733.0
Level III \| Bonds
Assets
Assets		0.0
Level III \| Commercial paper and other
Assets
Assets		0.0
Level III \| Foreign currency forward contracts
Assets
Foreign currency forward contracts	0.0
Liabilities
Foreign currency forward contracts	$ 0.0	$ 0.0

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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