Deferred Acquisition Costs and Other Actuarial Balances - Unearned Revenue Liability (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Other Actuarial Balances | |||
| Total unearned revenue liability | $ 527.5 | $ 515.4 | |
| Universal life | Benefits and Protection | Life Insurance | |||
| Other Actuarial Balances | |||
| Total unearned revenue liability | 522.4 | 510.1 | $ 485.5 |
| Other balances | |||
| Other Actuarial Balances | |||
| Total unearned revenue liability | $ 5.1 | $ 5.3 |