Investments - Schedule of Investments (Details) - USD ($) $ in Millions |
Sep. 30, 2025 |
Dec. 31, 2024 |
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| Investment Holdings [Line Items] | ||
| Total investments per Condensed Consolidated Balance Sheets | $ 222.5 | $ 221.9 |
| Consolidated Funds | ||
| Investment Holdings [Line Items] | ||
| Investments | 181.7 | 154.0 |
| Total investments per Condensed Consolidated Balance Sheets | 181.7 | 154.0 |
| Consolidated Entity Excluding Consolidated Funds | ||
| Investment Holdings [Line Items] | ||
| Total investments per Condensed Consolidated Balance Sheets | 40.8 | 67.9 |
| Consolidated Entity Excluding Consolidated Funds | Other investments | ||
| Investment Holdings [Line Items] | ||
| Investments | 3.4 | 19.4 |
| Consolidated Entity Excluding Consolidated Funds | Investments related to long-term incentive compensation plans | ||
| Investment Holdings [Line Items] | ||
| Investments | $ 37.4 | $ 48.5 |
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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