Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets
Investments at fair value	$ 4,246.7	$ 4,239.0
Liabilities
Loans payable of Consolidated Funds	3,721.2	3,866.3
Contingent consideration	1.3	1.5
Loans payable of a consolidated real estate VIE	72.6	79.4
Foreign currency forward contracts	7.4	10.0
Total Liabilities	3,802.5	3,957.2
Equity securities
Assets
Investments at fair value	9.7	10.3
Bonds
Assets
Investments at fair value	395.9	396.4
Loans
Assets
Investments at fair value	3,500.1	3,485.6
Other
Assets
Investments at fair value	2.0	1.4
Investments of Consolidated Funds
Assets
Investments at fair value	3,907.7	3,893.7
Investments in CLOs and other
Assets
Investments at fair value	222.9	152.6
Bonds
Assets
Investments at fair value	80.6	91.3
Commercial paper and other
Assets
Investments at fair value	34.8	98.9
Corporate treasury investments
Assets
Investments at fair value	115.4	190.2
Foreign currency forward contracts
Assets
Investments at fair value	0.7	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 consolidated real estate VIE	0.0	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	116.1	192.7
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Contingent consideration	0.0	0.0
Loans payable of a consolidated real estate VIE	0.0	0.0
Foreign currency forward contracts	7.4	10.0
Total Liabilities	7.4	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	80.6	91.3
Level II \| Commercial paper and other
Assets
Investments at fair value	34.8	98.9
Level II \| Corporate treasury investments
Assets
Investments at fair value	115.4	190.2
Level II \| Foreign currency forward contracts
Assets
Investments at fair value	0.7	2.5
Level III
Assets
Investments at fair value	4,130.6	4,046.3
Liabilities
Loans payable of Consolidated Funds	3,721.2	3,866.3
Contingent consideration	1.3	1.5
Loans payable of a consolidated real estate VIE	72.6	79.4
Foreign currency forward contracts	0.0	0.0
Total Liabilities	3,795.1	3,947.2
Level III \| Equity securities
Assets
Investments at fair value	9.7	10.3
Level III \| Bonds
Assets
Investments at fair value	395.9	396.4
Level III \| Loans
Assets
Investments at fair value	3,500.1	3,485.6
Level III \| Other
Assets
Investments at fair value	2.0	1.4
Level III \| Investments of Consolidated Funds
Assets
Investments at fair value	3,907.7	3,893.7
Level III \| Investments in CLOs and other
Assets
Investments at fair value	222.9	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

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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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