Investments - Schedule of Net Investment Earnings (Loss) (Details) - NGP Management - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Schedule of Equity Method Investments [Line Items] | ||||
| Management fee related revenues from NGP Management | $ 14.5 | $ 15.4 | $ 28.6 | $ 31.5 |
| Expenses related to the investment in NGP Management | (2.7) | (3.6) | (5.6) | (7.2) |
| Amortization of basis differences and impairment of investment in NGP Management | (8.4) | (8.8) | (17.2) | (101.3) |
| Net investment income (loss) from NGP Management | $ 3.4 | $ 3.0 | $ 5.8 | $ (77.0) |
| X | ||||||||||
- Definition Management Fees, Income (Loss) No definition available.
|
| X | ||||||||||
- Definition Net Realized Investment Gains Losses No definition available.
|
| X | ||||||||||
- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of expenses related to the generation of investment income. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Details
|