CONSOLIDATED INVESTMENT PRODUCTS - Fair Value Hierarchy Levels of Investments Held and Notes Issued by Consolidated Investment Products (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Total assets at fair value | $ 8,611.3 | $ 8,531.4 |
Consolidated | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Real estate investments | 502.6 | 552 |
Total assets at fair value | 8,611.3 | 8,531.4 |
Consolidated | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Real estate investments | 0 | 0 |
Total assets at fair value | 128.1 | 177.5 |
Consolidated | Significant Other Observable Inputs (Level 2) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Real estate investments | 0 | 0 |
Total assets at fair value | 7,084.9 | 6,979.7 |
Consolidated | Significant Unobservable Inputs (Level 3) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Real estate investments | 0 | 0 |
Total assets at fair value | 490.8 | 368.6 |
Consolidated | Investments Measured at NAV as a practical expedient | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Real estate investments | 502.6 | 552 |
Total assets at fair value | 907.5 | 1,005.6 |
Consolidated | Bank Loans | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 6,571.1 | 6,315.1 |
Consolidated | Bank Loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 0 | 0 |
Consolidated | Bank Loans | Significant Other Observable Inputs (Level 2) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 6,187.2 | 6,069.8 |
Consolidated | Bank Loans | Significant Unobservable Inputs (Level 3) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 383.9 | 245.3 |
Consolidated | Bank Loans | Investments Measured at NAV as a practical expedient | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 0 | 0 |
Consolidated | Bonds | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 727.3 | 697.5 |
Consolidated | Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 14 | 8.8 |
Consolidated | Bonds | Significant Other Observable Inputs (Level 2) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 713.3 | 688.2 |
Consolidated | Bonds | Significant Unobservable Inputs (Level 3) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 0 | 0.5 |
Consolidated | Bonds | Investments Measured at NAV as a practical expedient | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 0 | 0 |
Consolidated | Equity securities, Equity and fixed income mutual funds | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 226.4 | 274.9 |
Equity and fixed income mutual funds, and investments in other private equity funds | 171.4 | 230.7 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 88.3 | 129.9 |
Equity and fixed income mutual funds, and investments in other private equity funds | 25.8 | 38.8 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Significant Other Observable Inputs (Level 2) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 38.8 | 29.8 |
Equity and fixed income mutual funds, and investments in other private equity funds | 145.6 | 191.9 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Significant Unobservable Inputs (Level 3) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 99.3 | 115.2 |
Equity and fixed income mutual funds, and investments in other private equity funds | 0 | 0 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Investments Measured at NAV as a practical expedient | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Bank loan, bonds and equity securities | 0 | 0 |
Equity and fixed income mutual funds, and investments in other private equity funds | 0 | 0 |
Consolidated | Investments in other private equity funds | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Equity and fixed income mutual funds, and investments in other private equity funds | 412.5 | 461.2 |
Consolidated | Investments in other private equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Equity and fixed income mutual funds, and investments in other private equity funds | 0 | 0 |
Consolidated | Investments in other private equity funds | Significant Other Observable Inputs (Level 2) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Equity and fixed income mutual funds, and investments in other private equity funds | 0 | 0 |
Consolidated | Investments in other private equity funds | Significant Unobservable Inputs (Level 3) | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Equity and fixed income mutual funds, and investments in other private equity funds | 7.6 | 7.6 |
Consolidated | Investments in other private equity funds | Investments Measured at NAV as a practical expedient | | |
Segment Reporting, Other Significant Reconciling Items [Line Items] | | |
Equity and fixed income mutual funds, and investments in other private equity funds | $ 404.9 | $ 453.6 |