Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Assets
Investments at fair value	$ 4,676.2	$ 4,239.0
Liabilities
Loans payable of Consolidated Funds	3,794.8	3,866.3
Contingent consideration	1.3	1.5
Loans payable of a real estate VIE	0.0	79.4
Foreign currency forward contracts	3.9	10.0
Total Liabilities	3,800.0	3,957.2
Equity securities
Assets
Investments at fair value	26.8	10.3
Bonds
Assets
Investments at fair value	347.0	396.4
Loans
Assets
Investments at fair value	3,861.7	3,485.6
Other
Assets
Investments at fair value	0.3	1.4
Investments of Consolidated Funds
Assets
Investments at fair value	4,235.8	3,893.7
Investments in CLOs and other
Assets
Investments at fair value	322.7	152.6
Bonds
Assets
Investments at fair value	87.6	91.3
Commercial paper and other
Assets
Investments at fair value	29.8	98.9
Corporate treasury investments
Assets
Investments at fair value	117.4	190.2
Foreign currency forward contracts
Assets
Investments at fair value	0.3	2.5
Level I
Assets
Investments at fair value	0.0	0.0
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Contingent consideration	0.0	0.0
Loans payable of a real estate VIE		0.0
Foreign currency forward contracts	0.0	0.0
Total Liabilities	0.0	0.0
Level I \| Equity securities
Assets
Investments at fair value	0.0	0.0
Level I \| Bonds
Assets
Investments at fair value	0.0	0.0
Level I \| Loans
Assets
Investments at fair value	0.0	0.0
Level I \| Other
Assets
Investments at fair value	0.0	0.0
Level I \| Investments of Consolidated Funds
Assets
Investments at fair value	0.0	0.0
Level I \| Investments in CLOs and other
Assets
Investments at fair value	0.0	0.0
Level I \| Bonds
Assets
Investments at fair value	0.0	0.0
Level I \| Commercial paper and other
Assets
Investments at fair value	0.0	0.0
Level I \| Corporate treasury investments
Assets
Investments at fair value	0.0	0.0
Level I \| Foreign currency forward contracts
Assets
Investments at fair value	0.0	0.0
Level II
Assets
Investments at fair value	117.7	192.7
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Contingent consideration	0.0	0.0
Loans payable of a real estate VIE		0.0
Foreign currency forward contracts	3.9	10.0
Total Liabilities	3.9	10.0
Level II \| Equity securities
Assets
Investments at fair value	0.0	0.0
Level II \| Bonds
Assets
Investments at fair value	0.0	0.0
Level II \| Loans
Assets
Investments at fair value	0.0	0.0
Level II \| Other
Assets
Investments at fair value	0.0	0.0
Level II \| Investments of Consolidated Funds
Assets
Investments at fair value	0.0	0.0
Level II \| Investments in CLOs and other
Assets
Investments at fair value	0.0	0.0
Level II \| Bonds
Assets
Investments at fair value	87.6	91.3
Level II \| Commercial paper and other
Assets
Investments at fair value	29.8	98.9
Level II \| Corporate treasury investments
Assets
Investments at fair value	117.4	190.2
Level II \| Foreign currency forward contracts
Assets
Investments at fair value	0.3	2.5
Level III
Assets
Investments at fair value	4,558.5	4,046.3
Liabilities
Loans payable of Consolidated Funds	3,794.8	3,866.3
Contingent consideration	1.3	1.5
Loans payable of a real estate VIE		79.4
Foreign currency forward contracts	0.0	0.0
Total Liabilities	3,796.1	3,947.2
Level III \| Equity securities
Assets
Investments at fair value	26.8	10.3
Level III \| Bonds
Assets
Investments at fair value	347.0	396.4
Level III \| Loans
Assets
Investments at fair value	3,861.7	3,485.6
Level III \| Other
Assets
Investments at fair value	0.3	1.4
Level III \| Investments of Consolidated Funds
Assets
Investments at fair value	4,235.8	3,893.7
Level III \| Investments in CLOs and other
Assets
Investments at fair value	322.7	152.6
Level III \| Bonds
Assets
Investments at fair value	0.0	0.0
Level III \| Commercial paper and other
Assets
Investments at fair value	0.0	0.0
Level III \| Corporate treasury investments
Assets
Investments at fair value	0.0	0.0
Level III \| Foreign currency forward contracts
Assets
Investments at fair value	$ 0.0	$ 0.0

Fair value contingent consideration.

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The total amount of loans payable for a real estate VIE recorded at fair value.

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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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