Fair Value Measurement - Summary of Quantitative Information about Partnership's Level III Inputs (Details) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended |
Sep. 30, 2015USD ($)$ / shares | Dec. 31, 2014USD ($)Multiplier$ / shares |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 16,827.3 | $ 16,269.9 |
Level III | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | 21,031.2 | 21,783.6 |
Fair value of liabilities | 16,816.6 | 16,266.7 |
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 liabilities | $ 15,460 | $ 14,757.5 |
Valuation technique of liabilities | 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] | | |
Indicative Quotes (% of Par) | 35.00% | 35.00% |
Discount Rates (as a percent) | 1.00% | 1.00% |
Default Rates (as a percent) | 1.00% | 1.00% |
Recovery Rates (as a percent) | 60.00% | 63.00% |
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] | | |
Indicative Quotes (% of Par) | 102.00% | 100.00% |
Discount Rates (as a percent) | 11.00% | 11.00% |
Default Rates (as a percent) | 4.00% | 3.00% |
Recovery Rates (as a percent) | 75.00% | 75.00% |
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] | | |
Indicative Quotes (% of Par) | 98.00% | 98.00% |
Discount Rates (as a percent) | 3.00% | 3.00% |
Default Rates (as a percent) | 3.00% | 2.00% |
Recovery Rates (as a percent) | 66.00% | 68.00% |
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 | $ 1,186.2 | $ 1,278.8 |
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] | | |
Indicative Quotes (% of Par) | 1.00% | 1.00% |
Discount Rates (as a percent) | 8.00% | 8.00% |
Default Rates (as a percent) | 1.00% | 1.00% |
Recovery Rates (as a percent) | 60.00% | 63.00% |
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] | | |
Indicative Quotes (% of Par) | 116.00% | 132.00% |
Discount Rates (as a percent) | 15.00% | 15.00% |
Default Rates (as a percent) | 4.00% | 3.00% |
Recovery Rates (as a percent) | 75.00% | 75.00% |
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] | | |
Indicative Quotes (% of Par) | 59.00% | 63.00% |
Discount Rates (as a percent) | 11.00% | 10.00% |
Default Rates (as a percent) | 2.00% | 2.00% |
Recovery Rates (as a percent) | 66.00% | 68.00% |
Level III | Combination notes | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 18.9 | $ 15.9 |
Valuation technique of liabilities | Consensus Pricing | Consensus Pricing |
Level III | Combination notes | Consensus Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 90.00% | 97.00% |
Level III | Combination notes | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 96.00% | 98.00% |
Level III | Combination notes | Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 94.00% | 98.00% |
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 | $ 109.1 | $ 146.2 |
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% | 23.00% |
Discount to Expected Payment (as a percent) | 0.00% | 0.00% |
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% | 33.00% |
Discount to Expected Payment (as a percent) | 100.00% | 100.00% |
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% | 26.00% |
Discount to Expected Payment (as a percent) | 32.00% | 36.00% |
Level III | Derivative instruments of the CLOs | Counterparty Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 25.8 | $ 17.2 |
Valuation technique of liabilities | Counterparty Pricing | Counterparty Pricing |
Level III | Derivative instruments of the CLOs | Counterparty Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 6.00% | 2.00% |
Level III | Derivative instruments of the CLOs | Counterparty Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 35.00% | 22.00% |
Level III | Derivative instruments of the CLOs | Counterparty Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 20.00% | 11.00% |
Level III | Contingent cash consideration | Discounted Cash Flow | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of liabilities | $ 16.6 | $ 51.1 |
Valuation technique of liabilities | Discounted Cash Flow | Discounted Cash Flow |
Level III | Contingent cash consideration | Discounted Cash Flow | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 5.00% | 5.00% |
Assumed % of Total Potential Contingent Payments | 0.00% | 0.00% |
Level III | Contingent cash consideration | Discounted Cash Flow | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 21.00% | 18.00% |
Assumed % of Total Potential Contingent Payments | 100.00% | 100.00% |
Level III | Contingent cash consideration | Discounted Cash Flow | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | 11.00% | 13.00% |
Assumed % of Total Potential Contingent Payments | 6.00% | 20.00% |
Level III | Equity securities | Comparable Multiple 1 | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 938.3 | $ 1,783.7 |
Valuation technique of assets | Comparable Multiple | Comparable Multiple |
Level III | Equity securities | Comparable Multiple 1 | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Ltm Ebitda Multiple Range | 4.6 | 4.8 |
Level III | Equity securities | Comparable Multiple 1 | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Ltm Ebitda Multiple Range | 15.6 | 16.2 |
Level III | Equity securities | Comparable Multiple 1 | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Ltm Ebitda Multiple Range | 11.3 | 12.1 |
Level III | Equity securities | Comparable Multiple 2 | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | | $ 168.7 |
Valuation technique of assets | | Comparable Multiple |
Level III | Equity securities | Comparable Multiple 2 | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Forward EBITDA Multiple | Multiplier | | 8.4 |
Level III | Equity securities | Comparable Multiple 2 | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Forward EBITDA Multiple | Multiplier | | 8.4 |
Level III | Equity securities | Comparable Multiple 2 | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Forward EBITDA Multiple | Multiplier | | 8.4 |
Level III | Equity securities | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 17.7 | $ 16.1 |
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) | $ / shares | $ 0 | $ 0 |
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) | $ / shares | 245 | 246 |
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) | $ / shares | $ 0 | $ 0 |
Level III | Bonds | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 1,229.2 | $ 1,235.8 |
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) | 1.00% | 0.00% |
Level III | Bonds | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 142.00% | 133.00% |
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) | 98.00% | 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 | $ 15,427.6 | $ 14,873.4 |
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) | 2.00% | 0.00% |
Level III | Loans | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (% of Par) | 138.00% | 126.00% |
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) | 98.00% | 98.00% |
Level III | Loans | Market Yield Analysis | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 54.6 | $ 211.5 |
Valuation technique of assets | Market Yield Analysis | Market Yield Analysis |
Level III | Loans | Market Yield Analysis | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Market Yield (as a percent) | 5.00% | 5.00% |
Level III | Loans | Market Yield Analysis | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Market Yield (as a percent) | 16.00% | 17.00% |
Level III | Loans | Market Yield Analysis | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Market Yield (as a percent) | 11.00% | 11.00% |
Level III | Partnership and LLC interests | NAV of Underlying Fund | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 3,350.2 | $ 3,481 |
Valuation technique of assets | NAV of Underlying Fund(1) | NAV of Underlying Fund(1) |
Level III | Other | Counterparty Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 3.3 | $ 1.5 |
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 (as a percent) | 0.00% | 0.00% |
Level III | Other | Counterparty Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 15.00% | 6.00% |
Level III | Other | Counterparty Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 5.00% | 3.00% |
Level III | Investments of Consolidated Funds | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 21,020.9 | $ 21,771.7 |
Level III | Trading securities and other | Comparable Multiple 1 | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 1.6 | $ 3 |
Valuation technique of assets | Comparable Multiple | Comparable Multiple |
Level III | Trading securities and other | Comparable Multiple 1 | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Ltm Ebitda Multiple Range | 5.8 | 5.8 |
Level III | Trading securities and other | Comparable Multiple 1 | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Ltm Ebitda Multiple Range | 5.8 | 5.8 |
Level III | Trading securities and other | Comparable Multiple 1 | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Ltm Ebitda Multiple Range | 5.8 | 5.8 |
Level III | Trading securities and other | Discounted Cash Flow | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | | $ 0.3 |
Valuation technique of assets | | Discounted Cash Flow |
Level III | Trading securities and other | Discounted Cash Flow | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | | 10.00% |
Level III | Trading securities and other | 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% |
Level III | Trading securities and other | Discounted Cash Flow | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Discount Rates (as a percent) | | 10.00% |
Level III | Restricted securities of Consolidated Funds | Consensus Pricing | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Fair value of assets | $ 8.7 | $ 8.6 |
Valuation technique of assets | Consensus Pricing | Consensus Pricing |
Level III | Restricted securities of Consolidated Funds | Consensus Pricing | Minimum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 87.00% | 87.00% |
Level III | Restricted securities of Consolidated Funds | Consensus Pricing | Maximum | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 87.00% | 87.00% |
Level III | Restricted securities of Consolidated Funds | Consensus Pricing | Weighted Average | | |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | | |
Indicative Quotes (as a percent) | 87.00% | 87.00% |