Investment Securities - Fair Value of Investments In Private Equity Funds Subject to Lock-Up Periods (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt and Equity Securities, FV-NI [Line Items] | ||
| 1 – 3 years | $ 52.3 | |
| 3 – 5 years | 7.1 | |
| 5 – 10 years | 188.8 | |
| >10 years | 0.0 | |
| Total | 3,316.2 | $ 2,958.5 |
| Unfunded Commitments | 91.0 | $ 65.8 |
| Private equity funds | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Total | $ 248.2 |
| X | ||||||||||
- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of long-term investments classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| 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 | ||||||||||
- Definition Other Long-term Investments, Remaining Period, Five to Ten Years No definition available.
|
| X | ||||||||||
- Definition Other Long-term Investments, Remaining Period, Greater than 10 Years No definition available.
|
| X | ||||||||||
- Definition Other Long-term Investments, Remaining Period, One to Three Years No definition available.
|
| X | ||||||||||
- Definition Other Long-term Investments, Remaining Period, Three to Five Years No definition available.
|
| X | ||||||||||
- Details
|