Investments - Partnership's Equity Method Investees, Summarized Balance Sheet Information (Detail) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Schedule of Investments [Line Items] | ||
| Investments | $ 68,441.3 | $ 69,723.3 |
| Total assets | 72,249.8 | 75,415.2 |
| Debt | 2,236.3 | 2,070.4 |
| Other liabilities | 1,389.7 | 1,111.4 |
| Total liabilities | 3,626.0 | 3,181.8 |
| Partners’ capital | 68,623.8 | 72,233.4 |
| Corporate Private Equity | ||
| Schedule of Investments [Line Items] | ||
| Investments | 31,427.7 | 35,535.4 |
| Total assets | 33,605.0 | 39,489.9 |
| Debt | 416.2 | 281.5 |
| Other liabilities | 607.2 | 540.7 |
| Total liabilities | 1,023.4 | 822.2 |
| Partners’ capital | 32,581.6 | 38,667.7 |
| Real Assets | ||
| Schedule of Investments [Line Items] | ||
| Investments | 21,460.2 | 21,182.7 |
| Total assets | 22,666.0 | 22,393.2 |
| Debt | 1,552.9 | 1,512.5 |
| Other liabilities | 384.1 | 331.4 |
| Total liabilities | 1,937.0 | 1,843.9 |
| Partners’ capital | 20,729.0 | 20,549.3 |
| Global Market Strategies | ||
| Schedule of Investments [Line Items] | ||
| Investments | 2,240.8 | 2,262.1 |
| Total assets | 2,502.5 | 2,604.0 |
| Debt | 170.4 | 176.6 |
| Other liabilities | 94.3 | 17.7 |
| Total liabilities | 264.7 | 194.3 |
| Partners’ capital | 2,237.8 | 2,409.7 |
| Investment Solutions | ||
| Schedule of Investments [Line Items] | ||
| Investments | 13,312.6 | 10,743.1 |
| Total assets | 13,476.3 | 10,928.1 |
| Debt | 96.8 | 99.8 |
| Other liabilities | 304.1 | 221.6 |
| Total liabilities | 400.9 | 321.4 |
| Partners’ capital | $ 13,075.4 | $ 10,606.7 |