CONSOLIDATED INVESTMENT PRODUCTS - Fair Value Hierarchy Levels of Investments Held and Notes Issued by Consolidated Investment Products (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 |
Assets: | | |
Total assets at fair value | $ 7,793.5 | $ 8,765.9 |
Consolidated | | |
Assets: | | |
Real estate investments | 416.6 | 463.6 |
Total assets at fair value | 7,793.5 | 8,765.9 |
Consolidated | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Assets: | | |
Real estate investments | 0 | 0 |
Total assets at fair value | 33.6 | 106.5 |
Consolidated | Significant Other Observable Inputs (Level 2) | | |
Assets: | | |
Real estate investments | 0 | 0 |
Total assets at fair value | 6,560.3 | 6,944.5 |
Consolidated | Significant Unobservable Inputs (Level 3) | | |
Assets: | | |
Real estate investments | 0 | 0 |
Total assets at fair value | 328.4 | 825.8 |
Consolidated | Investments Measured at NAV as a practical expedient | | |
Assets: | | |
Real estate investments | 416.6 | 463.6 |
Total assets at fair value | 871.2 | 889.1 |
Consolidated | Bank loans | | |
Assets: | | |
Bank loan, bonds and equity securities | 6,069.8 | 6,837.2 |
Consolidated | Bank loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Assets: | | |
Bank loan, bonds and equity securities | 0 | 0 |
Consolidated | Bank loans | Significant Other Observable Inputs (Level 2) | | |
Assets: | | |
Bank loan, bonds and equity securities | 5,819.3 | 6,140.1 |
Consolidated | Bank loans | Significant Unobservable Inputs (Level 3) | | |
Assets: | | |
Bank loan, bonds and equity securities | 250.5 | 697.1 |
Consolidated | Bank loans | Investments Measured at NAV as a practical expedient | | |
Assets: | | |
Bank loan, bonds and equity securities | 0 | 0 |
Consolidated | Bonds | | |
Assets: | | |
Bank loan, bonds and equity securities | 608.1 | 669.8 |
Consolidated | Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Assets: | | |
Bank loan, bonds and equity securities | 7.7 | 13.3 |
Consolidated | Bonds | Significant Other Observable Inputs (Level 2) | | |
Assets: | | |
Bank loan, bonds and equity securities | 600.1 | 656.2 |
Consolidated | Bonds | Significant Unobservable Inputs (Level 3) | | |
Assets: | | |
Bank loan, bonds and equity securities | 0.3 | 0.3 |
Consolidated | Bonds | Investments Measured at NAV as a practical expedient | | |
Assets: | | |
Bank loan, bonds and equity securities | 0 | 0 |
Consolidated | Equity securities, Equity and fixed income mutual funds | | |
Assets: | | |
Bank loan, bonds and equity securities | 124.1 | 231.9 |
Equity and fixed income mutual funds, and investments in other private equity funds | 120.3 | 137.9 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Assets: | | |
Bank loan, bonds and equity securities | 25.2 | 85.2 |
Equity and fixed income mutual funds, and investments in other private equity funds | 0.7 | 8 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Significant Other Observable Inputs (Level 2) | | |
Assets: | | |
Bank loan, bonds and equity securities | 21.3 | 18.3 |
Equity and fixed income mutual funds, and investments in other private equity funds | 119.6 | 129.9 |
Consolidated | Equity securities, Equity and fixed income mutual funds | Significant Unobservable Inputs (Level 3) | | |
Assets: | | |
Bank loan, bonds and equity securities | 77.6 | 128.4 |
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 | | |
Assets: | | |
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 | | |
Assets: | | |
Equity and fixed income mutual funds, and investments in other private equity funds | 454.6 | 425.5 |
Consolidated | Investments in other private equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | | |
Assets: | | |
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) | | |
Assets: | | |
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) | | |
Assets: | | |
Equity and fixed income mutual funds, and investments in other private equity funds | 0 | 0 |
Consolidated | Investments in other private equity funds | Investments Measured at NAV as a practical expedient | | |
Assets: | | |
Equity and fixed income mutual funds, and investments in other private equity funds | $ 454.6 | $ 425.5 |