Fair Value Measurement - Partnership's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Assets
Investments of Consolidated Funds	$ 4,211.3	$ 4,239.0
Liabilities
Loans payable of Consolidated Funds	3,587.5	3,866.3
Contingent consideration	1.5	1.5
Loans payable of a consolidated real estate VIE	77.8	79.4
Foreign currency forward contracts	6.0	10.0
Total Liabilities	3,672.8	3,957.2
Equity securities
Assets
Investments of Consolidated Funds	10.8	10.3
Bonds
Assets
Investments of Consolidated Funds	417.6	396.4
Loans
Assets
Investments of Consolidated Funds	3,473.2	3,485.6
Other
Assets
Investments of Consolidated Funds	1.5	1.4
Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	3,903.1	3,893.7
Investments in CLOs and other
Assets
Investments of Consolidated Funds		152.6
Investments in CLOs and other
Assets
Investments of Consolidated Funds	155.9
Bonds
Assets
Investments of Consolidated Funds	87.8	91.3
Commercial paper and other
Assets
Investments of Consolidated Funds	61.1	98.9
Corporate treasury investments
Assets
Investments of Consolidated Funds	148.9	190.2
Foreign currency forward contracts
Assets
Investments of Consolidated Funds	3.4	2.5
Level I
Assets
Investments of Consolidated Funds	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 of Consolidated Funds	0.0	0.0
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 \| Other
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Investments in CLOs and other
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	0.0
Level I \| Commercial paper and other
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Corporate treasury investments
Assets
Investments of Consolidated Funds	0.0	0.0
Level I \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	0.0	0.0
Level II
Assets
Investments of Consolidated Funds	152.3	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	6.0	10.0
Total Liabilities	6.0	10.0
Level II \| Equity securities
Assets
Investments of Consolidated Funds	0.0	0.0
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 \| Other
Assets
Investments of Consolidated Funds	0.0	0.0
Level II \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	0.0	0.0
Level II \| Investments in CLOs and other
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	87.8	91.3
Level II \| Commercial paper and other
Assets
Investments of Consolidated Funds	61.1	98.9
Level II \| Corporate treasury investments
Assets
Investments of Consolidated Funds	148.9	190.2
Level II \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	3.4	2.5
Level III
Assets
Investments of Consolidated Funds	4,059.0	4,046.3
Liabilities
Loans payable of Consolidated Funds	3,587.5	3,866.3
Contingent consideration	1.5	1.5
Loans payable of a consolidated real estate VIE	77.8	79.4
Foreign currency forward contracts	0.0	0.0
Total Liabilities	3,666.8	3,947.2
Level III \| Equity securities
Assets
Investments of Consolidated Funds	10.8	10.3
Level III \| Bonds
Assets
Investments of Consolidated Funds	417.6	396.4
Level III \| Loans
Assets
Investments of Consolidated Funds	3,473.2	3,485.6
Level III \| Other
Assets
Investments of Consolidated Funds	1.5	1.4
Level III \| Investments of Consolidated Funds
Assets
Investments of Consolidated Funds	3,903.1	3,893.7
Level III \| Investments in CLOs and other
Assets
Investments of Consolidated Funds		152.6
Level III \| Investments in CLOs and other
Assets
Investments of Consolidated Funds	155.9
Level III \| Bonds
Assets
Investments of Consolidated Funds	0.0	0.0
Level III \| Commercial paper and other
Assets
Investments of Consolidated Funds	0.0	0.0
Level III \| Corporate treasury investments
Assets
Investments of Consolidated Funds	0.0	0.0
Level III \| Foreign currency forward contracts
Assets
Investments of Consolidated Funds	$ 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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