Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Assets
Investments of Consolidated Funds	$ 3,643.4	$ 24,018.5
Liabilities
Loans payable of Consolidated Funds	3,253.4	17,046.7
Derivative instruments of the CLOs		29.1
Contingent consideration	11.4	20.8
Loans payable of a consolidated real estate VIE	88.9	75.4
Interest rate swaps		0.9
Foreign currency forward contracts	19.9	2.8
Total Liabilities	3,373.6	17,175.7
Equity securities
Assets
Investments of Consolidated Funds	10.5	1,141.7
Bonds
Assets
Investments of Consolidated Funds	396.4	1,180.9
Loans
Assets
Investments of Consolidated Funds	2,982.3	15,686.7
Partnership and LLC interests
Assets
Investments of Consolidated Funds		3,143.3
Hedge funds
Assets
Investments of Consolidated Funds		2,841.2
Other
Assets
Investments of Consolidated Funds	1.7	5.0
Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	3,390.9	23,998.8
Trading securities
Assets
Investments of Consolidated Funds		1.4
Investments in CLOs and other
Assets
Investments of Consolidated Funds	157.3
Bonds
Assets
Investments of Consolidated Funds	55.1
Commercial paper and other
Assets
Investments of Consolidated Funds	40.0
Corporate treasury investments
Assets
Investments of Consolidated Funds	95.1
Foreign currency forward contracts
Assets
Investments of Consolidated Funds	0.1	1.7
Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds		16.6
Level I
Assets
Investments of Consolidated Funds	0.0	262.5
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Derivative instruments of the CLOs		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
Foreign currency forward contracts	0.0	0.0
Total Liabilities	0.0	0.0
Level I \| Equity securities
Assets
Investments of Consolidated Funds	0.0	254.6
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
Level I \| Hedge funds
Assets
Investments of Consolidated Funds		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	0.0	254.6
Level I \| Trading securities
Assets
Investments of Consolidated Funds		0.0
Level I \| Investments in CLOs and other
Assets
Investments of Consolidated Funds	0.0
Level I \| Bonds
Assets
Investments of Consolidated Funds	0.0
Level I \| Commercial paper and other
Assets
Investments of Consolidated Funds	0.0
Level I \| Corporate treasury investments
Assets
Investments of Consolidated Funds	0.0
Level I \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds		7.9
Level II
Assets
Investments of Consolidated Funds	95.2	313.5
Liabilities
Loans payable of Consolidated Funds	0.0	0.0
Derivative instruments of the CLOs		0.0
Contingent consideration	0.0	0.0
Loans payable of a consolidated real estate VIE	0.0	0.0
Interest rate swaps		0.9
Foreign currency forward contracts	19.9	2.8
Total Liabilities	19.9	3.7
Level II \| Equity securities
Assets
Investments of Consolidated Funds	0.0	311.8
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
Level II \| Hedge funds
Assets
Investments of Consolidated Funds		0.0
Level II \| Other
Assets
Investments of Consolidated Funds	0.0	0.0
Level II \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	0.0	311.8
Level II \| Trading securities
Assets
Investments of Consolidated Funds		0.0
Level II \| Investments in CLOs and other
Assets
Investments of Consolidated Funds	0.0
Level II \| Bonds
Assets
Investments of Consolidated Funds	55.1
Level II \| Commercial paper and other
Assets
Investments of Consolidated Funds	40.0
Level II \| Corporate treasury investments
Assets
Investments of Consolidated Funds	95.1
Level II \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	0.1	1.7
Level II \| Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds		0.0
Level III
Assets
Investments of Consolidated Funds	3,548.2	17,517.6
Liabilities
Loans payable of Consolidated Funds	3,253.4	17,046.7
Derivative instruments of the CLOs		29.1
Contingent consideration	11.4	20.8
Loans payable of a consolidated real estate VIE	88.9	75.4
Interest rate swaps		0.0
Foreign currency forward contracts	0.0	0.0
Total Liabilities	3,353.7	17,172.0
Level III \| Equity securities
Assets
Investments of Consolidated Funds	10.5	575.3
Level III \| Bonds
Assets
Investments of Consolidated Funds	396.4	1,180.9
Level III \| Loans
Assets
Investments of Consolidated Funds	2,982.3	15,686.7
Level III \| Partnership and LLC interests
Assets
Investments of Consolidated Funds		59.6
Level III \| Hedge funds
Assets
Investments of Consolidated Funds		0.0
Level III \| Other
Assets
Investments of Consolidated Funds	1.7	5.0
Level III \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	3,390.9	17,507.5
Level III \| Trading securities
Assets
Investments of Consolidated Funds		1.4
Level III \| Investments in CLOs and other
Assets
Investments of Consolidated Funds	157.3
Level III \| Bonds
Assets
Investments of Consolidated Funds	0.0
Level III \| Commercial paper and other
Assets
Investments of Consolidated Funds	0.0
Level III \| Corporate treasury investments
Assets
Investments of Consolidated Funds	0.0
Level III \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	$ 0.0	0.0
Level III \| Restricted securities of Consolidated Funds
Assets
Investments of Consolidated Funds		$ 8.7

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