Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets
Investments of Consolidated Funds	$ 24,021.5	$ 26,044.7
Liabilities
Loans payable of Consolidated Funds	16,665.1	16,052.2
Derivative instruments of the CLOs	25.8	17.2
Contingent consideration	16.6	51.1
Loans payable of a consolidated real estate VIE	109.1	146.2
Interest rate swaps	1.4	3.2
Foreign currency forward contracts	9.3
Total Liabilities	16,827.3	16,269.9
Equity securities
Assets
Investments of Consolidated Funds	1,264.9	2,472.1
Bonds
Assets
Investments of Consolidated Funds	1,229.2	1,235.8
Loans
Assets
Investments of Consolidated Funds	15,482.2	15,084.9
Partnership and LLC interests
Assets
Investments of Consolidated Funds	3,350.2	3,481.0
Hedge funds
Assets
Investments of Consolidated Funds	2,660.3	3,753.5
Other
Assets
Investments of Consolidated Funds	3.3	1.5
Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	23,990.1	26,028.8
Trading securities
Assets
Investments of Consolidated Funds	1.6	3.3
Foreign currency forward contracts
Assets
Investments of Consolidated Funds	13.3
Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds	16.5	12.6
Level I
Assets
Investments of Consolidated Funds	244.9	350.8
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Derivative instruments of the CLOs	0.0	0.0
Contingent consideration	0.0	0.0
Loans payable of a consolidated real estate VIE	0.0	0.0
Interest rate swaps	0.0	0.0
Foreign currency forward contracts	0.0
Total Liabilities	0.0	0.0
Level I \| Equity securities
Assets
Investments of Consolidated Funds	237.1	346.8
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 \| Partnership and LLC interests
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Hedge funds
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Other
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	237.1	346.8
Level I \| Trading securities
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	0.0
Level I \| Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds	7.8	4.0
Level II
Assets
Investments of Consolidated Funds	2,745.4	3,910.3
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Derivative instruments of the CLOs	0.0	0.0
Contingent consideration	0.0	0.0
Loans payable of a consolidated real estate VIE	0.0	0.0
Interest rate swaps	1.4	3.2
Foreign currency forward contracts	9.3
Total Liabilities	10.7	3.2
Level II \| Equity securities
Assets
Investments of Consolidated Funds	71.8	156.8
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 \| Partnership and LLC interests
Assets
Investments of Consolidated Funds	0.0	0.0
Level II \| Hedge funds
Assets
Investments of Consolidated Funds	2,660.3	3,753.5
Level II \| Other
Assets
Investments of Consolidated Funds	0.0	0.0
Level II \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	2,732.1	3,910.3
Level II \| Trading securities
Assets
Investments of Consolidated Funds	0.0	0.0
Level II \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	13.3
Level II \| Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds	0.0	0.0
Level III
Assets
Investments of Consolidated Funds	21,031.2	21,783.6
Liabilities
Loans payable of Consolidated Funds	16,665.1	16,052.2
Derivative instruments of the CLOs	25.8	17.2
Contingent consideration	16.6	51.1
Loans payable of a consolidated real estate VIE	109.1	146.2
Interest rate swaps	0.0	0.0
Foreign currency forward contracts	0.0
Total Liabilities	16,816.6	16,266.7
Level III \| Equity securities
Assets
Investments of Consolidated Funds	956.0	1,968.5
Level III \| Bonds
Assets
Investments of Consolidated Funds	1,229.2	1,235.8
Level III \| Loans
Assets
Investments of Consolidated Funds	15,482.2	15,084.9
Level III \| Partnership and LLC interests
Assets
Investments of Consolidated Funds	3,350.2	3,481.0
Level III \| Hedge funds
Assets
Investments of Consolidated Funds	0.0	0.0
Level III \| Other
Assets
Investments of Consolidated Funds	3.3	1.5
Level III \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	21,020.9	21,771.7
Level III \| Trading securities
Assets
Investments of Consolidated Funds	1.6	3.3
Level III \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	0.0
Level III \| Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds	$ 8.7	$ 8.6

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