Fair Value Measurement - Summary of Quantitative Information about Partnership's Level III Inputs (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
Jun. 30, 2017 | Dec. 31, 2016 |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 3,802.5 | $ 3,957.2 |
Level III | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | 3,795.1 | 3,947.2 |
Level III | Senior secured notes | Other | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 3,544.7 | $ 3,672.5 |
Valuation technique of liabilities | Other | Other |
Level III | Subordinated notes and preferred shares | Discounted Cash Flow with Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 147.1 | $ 166.9 |
Valuation technique of liabilities | Discounted Cash Flow with Consensus Pricing | Discounted Cash Flow with Consensus Pricing |
Level III | Subordinated notes and preferred shares | Discounted Cash Flow with Consensus Pricing | Minimum | | |
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) | | 7.00% |
Default Rates (as a percent) | 1.00% | 1.00% |
Recovery Rates (as a percent) | 50.00% | 50.00% |
Level III | Subordinated notes and preferred shares | Discounted Cash Flow with Consensus Pricing | Maximum | | |
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) | | 90.00% |
Default Rates (as a percent) | 3.00% | 3.00% |
Recovery Rates (as a percent) | 70.00% | 74.00% |
Level III | Subordinated notes and preferred shares | Discounted Cash Flow with Consensus Pricing | Weighted Average | | |
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) | | 68.00% |
Default Rates (as a percent) | 2.00% | 2.00% |
Recovery Rates (as a percent) | 60.00% | 66.00% |
Level III | Subordinated notes and preferred shares | Other | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 29.4 | $ 26.9 |
Valuation technique of liabilities | Other | Other |
Level III | Loans Payable of Consolidated Funds | Discounted Cash Flow with Consensus Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 9.00% | |
Level III | Loans Payable of Consolidated Funds | Discounted Cash Flow with Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 99.00% | |
Level III | Loans Payable of Consolidated Funds | Discounted Cash Flow with Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 82.00% | |
Level III | Loans Payable of a consolidated real estate VIE | Discounted Cash Flow | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 72.6 | $ 79.4 |
Valuation technique of liabilities | Discounted Cash Flow | Discounted Cash Flow |
Level III | Loans Payable of a consolidated real estate VIE | Discounted Cash Flow | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 20.00% | 20.00% |
Discount to Expected Payment (as a percent) | 10.00% | 10.00% |
Level III | Loans Payable of a consolidated real estate VIE | Discounted Cash Flow | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 30.00% | 30.00% |
Discount to Expected Payment (as a percent) | 55.00% | 55.00% |
Level III | Loans Payable of a consolidated real estate VIE | Discounted Cash Flow | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 23.00% | 23.00% |
Discount to Expected Payment (as a percent) | 35.00% | 37.00% |
Level III | Contingent consideration | Other | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 1.3 | $ 1.5 |
Valuation technique of liabilities | Other | Other |
Level III | Equity securities | Discounted Cash Flow | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 8.8 | $ 9.6 |
Valuation technique of assets | Discounted Cash Flow | Discounted Cash Flow |
Level III | Equity securities | Discounted Cash Flow | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 9.00% | 9.00% |
Exit Cap Rate (as a percent) | 7.00% | 7.00% |
Level III | Equity securities | Discounted Cash Flow | Maximum | | |
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% |
Level III | Equity securities | Discounted Cash Flow | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 9.00% | 9.00% |
Exit Cap Rate (as a percent) | 7.00% | 7.00% |
Level III | Equity securities | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 0.9 | $ 0.7 |
Valuation technique of assets | Consensus Pricing | Consensus Pricing |
Level III | Equity securities | Consensus Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes ($ per share) | $ 13 | $ 10 |
Level III | Equity securities | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes ($ per share) | 13 | 10 |
Level III | Equity securities | Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes ($ per share) | $ 13 | $ 10 |
Level III | Bonds | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 395.9 | $ 396.4 |
Valuation technique of assets | Consensus Pricing | Consensus Pricing |
Level III | Bonds | Consensus Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 7.00% | 74.00% |
Level III | Bonds | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 110.00% | 108.00% |
Level III | Bonds | Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 101.00% | 99.00% |
Level III | Loans | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 3,500.1 | $ 3,485.6 |
Valuation technique of assets | Consensus Pricing | Consensus Pricing |
Level III | Loans | Consensus Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 49.00% | 31.00% |
Level III | Loans | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 102.00% | 102.00% |
Level III | Loans | Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 100.00% | 99.00% |
Level III | Other | Counterparty Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 2 | $ 1.4 |
Valuation technique of assets | Counterparty Pricing | Counterparty Pricing |
Level III | Other | Counterparty Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Notional Amount) | 8.00% | 6.00% |
Level III | Other | Counterparty Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Notional Amount) | 9.00% | 8.00% |
Level III | Other | Counterparty Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Notional Amount) | 8.00% | 7.00% |
Level III | Other | Comparable Multiple | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 2.2 | $ 1.3 |
Valuation technique of assets | Comparable Multiple | Comparable Multiple |
Level III | Other | Comparable Multiple | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
LTM EBITDA Multiple | 5.8 | 5.7 |
Level III | Other | Comparable Multiple | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
LTM EBITDA Multiple | 5.8 | 5.7 |
Level III | Other | Comparable Multiple | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
LTM EBITDA Multiple | 5.8 | 5.7 |
Level III | Investments of Consolidated Funds | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 3,907.7 | $ 3,893.7 |
Level III | Senior secured notes | Discounted Cash Flow with Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 181.1 | $ 115.9 |
Valuation technique of assets | Discounted Cash Flow with Consensus Pricing | Discounted Cash Flow with Consensus Pricing |
Level III | Senior secured notes | Discounted Cash Flow with Consensus Pricing | Minimum | | |
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) | 91.00% | 82.00% |
Default Rates (as a percent) | 1.00% | 1.00% |
Recovery Rates (as a percent) | 50.00% | 50.00% |
Level III | Senior secured notes | Discounted Cash Flow with Consensus Pricing | Maximum | | |
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% |
Level III | Senior secured notes | Discounted Cash Flow with Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 2.00% | 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% |
Level III | Subordinated notes, preferred shares and other | Discounted Cash Flow with Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 39.6 | $ 35.4 |
Valuation technique of assets | Discounted Cash Flow with Consensus Pricing | Discounted Cash Flow with Consensus Pricing |
Level III | Subordinated notes, preferred shares and other | Discounted Cash Flow with Consensus Pricing | Minimum | | |
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) | 0.00% | 2.00% |
Default Rates (as a percent) | 1.00% | 1.00% |
Recovery Rates (as a percent) | 50.00% | 50.00% |
Level III | Subordinated notes, preferred shares and other | Discounted Cash Flow with Consensus Pricing | Maximum | | |
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) | 100.00% | 101.00% |
Default Rates (as a percent) | 3.00% | 10.00% |
Recovery Rates (as a percent) | 70.00% | 74.00% |
Level III | Subordinated notes, preferred shares and other | Discounted Cash Flow with Consensus Pricing | Weighted Average | | |
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) | 92.00% | 96.00% |
Default Rates (as a percent) | 2.00% | 2.00% |
Recovery Rates (as a percent) | 60.00% | 64.00% |
Level III | Investments in CLOs and other | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 4,130.6 | $ 4,046.3 |