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Fair Value Measurement - Summary of Quantitative Information about Partnership's Level III Inputs (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	$ 3,800.0	$ 3,957.2
Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	3,796.1	3,947.2
Investments of Consolidated Funds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	4,235.8	3,893.7
Investments in CLOs and other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	4,558.5	4,046.3
Discounted Cash Flow | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	24.9	9.6
Consensus Pricing | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	1.9	0.7
Consensus Pricing | Bonds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	347.0	396.4
Consensus Pricing | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	3,861.7	3,485.6
Counterparty Pricing | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	0.3	1.4
Discounted Cash Flow with Consensus Pricing | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	275.8	115.9
Discounted Cash Flow with Consensus Pricing | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	44.0	35.4
Comparable Multiple | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	$ 2.9	$ 1.3
Minimum | Discounted Cash Flow | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	6.00%	9.00%
Exit Cap Rate (as a percent)	7.00%	7.00%
Minimum | Consensus Pricing | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes ($ per share)	$ 28	$ 10
Minimum | Consensus Pricing | Bonds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Par)	65.00%	74.00%
Minimum | Consensus Pricing | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Par)	49.00%	31.00%
Minimum | Counterparty Pricing | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Notional Amount)	11.00%	6.00%
Minimum | Discounted Cash Flow with Consensus Pricing | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	1.00%	1.00%
Indicative Quotes (% of Par)	95.00%	82.00%
Default Rates (as a percent)	1.00%	1.00%
Recovery Rates (as a percent)	50.00%	50.00%
Minimum | Discounted Cash Flow with Consensus Pricing | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	8.00%	9.00%
Indicative Quotes (% of Par)	71.00%	2.00%
Default Rates (as a percent)	1.00%	1.00%
Recovery Rates (as a percent)	50.00%	50.00%
Minimum | Comparable Multiple | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LTM EBITDA Multiple	6.3	5.7
Maximum | Discounted Cash Flow | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	10.00%	10.00%
Exit Cap Rate (as a percent)	10.00%	9.00%
Maximum | Consensus Pricing | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes ($ per share)	$ 28	$ 10
Maximum | Consensus Pricing | Bonds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Par)	110.00%	108.00%
Maximum | Consensus Pricing | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Par)	102.00%	102.00%
Maximum | Counterparty Pricing | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Notional Amount)	11.00%	8.00%
Maximum | Discounted Cash Flow with Consensus Pricing | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	9.00%	11.00%
Indicative Quotes (% of Par)	102.00%	102.00%
Default Rates (as a percent)	3.00%	3.00%
Recovery Rates (as a percent)	70.00%	74.00%
Maximum | Discounted Cash Flow with Consensus Pricing | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	10.00%	14.00%
Indicative Quotes (% of Par)	97.00%	101.00%
Default Rates (as a percent)	3.00%	10.00%
Recovery Rates (as a percent)	70.00%	74.00%
Maximum | Comparable Multiple | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LTM EBITDA Multiple	6.3	5.7
Weighted Average | Discounted Cash Flow | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	6.00%	9.00%
Exit Cap Rate (as a percent)	7.00%	7.00%
Weighted Average | Consensus Pricing | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes ($ per share)	$ 28	$ 10
Weighted Average | Consensus Pricing | Bonds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Par)	99.00%	99.00%
Weighted Average | Consensus Pricing | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Par)	100.00%	99.00%
Weighted Average | Counterparty Pricing | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Indicative Quotes (% of Notional Amount)	11.00%	7.00%
Weighted Average | Discounted Cash Flow with Consensus Pricing | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	3.00%	2.00%
Indicative Quotes (% of Par)	100.00%	99.00%
Default Rates (as a percent)	2.00%	2.00%
Recovery Rates (as a percent)	60.00%	71.00%
Weighted Average | Discounted Cash Flow with Consensus Pricing | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	9.00%	12.00%
Indicative Quotes (% of Par)	87.00%	96.00%
Default Rates (as a percent)	2.00%	2.00%
Recovery Rates (as a percent)	60.00%	64.00%
Weighted Average | Comparable Multiple | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
LTM EBITDA Multiple	6.3	5.7
Senior secured notes | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	$ 3,621.3	$ 3,672.5
Subordinated notes and preferred shares | Discounted Cash Flow with Consensus Pricing | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	146.2	166.9
Subordinated notes and preferred shares | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	$ 27.3	$ 26.9
Subordinated notes and preferred shares | Minimum | Discounted Cash Flow with Consensus Pricing | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	8.00%	9.00%
Indicative Quotes (% of Par)	79.00%	7.00%
Default Rates (as a percent)	1.00%	1.00%
Recovery Rates (as a percent)	50.00%	50.00%
Subordinated notes and preferred shares | Maximum | Discounted Cash Flow with Consensus Pricing | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	10.00%	14.00%
Indicative Quotes (% of Par)	94.00%	90.00%
Default Rates (as a percent)	3.00%	3.00%
Recovery Rates (as a percent)	70.00%	74.00%
Subordinated notes and preferred shares | Weighted Average | Discounted Cash Flow with Consensus Pricing | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)	9.00%	12.00%
Indicative Quotes (% of Par)	86.00%	68.00%
Default Rates (as a percent)	2.00%	2.00%
Recovery Rates (as a percent)	60.00%	66.00%
Loans payable of a real estate VIE | Discounted Cash Flow | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities		$ 79.4
Loans payable of a real estate VIE | Minimum | Discounted Cash Flow | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)		20.00%
Discount to Expected Payment		10.00%
Loans payable of a real estate VIE | Maximum | Discounted Cash Flow | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)		30.00%
Discount to Expected Payment		55.00%
Loans payable of a real estate VIE | Weighted Average | Discounted Cash Flow | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount Rates (as a percent)		23.00%
Discount to Expected Payment		37.00%
Contingent consideration | Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	$ 1.3	$ 1.5

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