Statutory Requirements and Dividends Restrictions - Additional Information (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
USD ($)
| |
| Statutory Accounting Practices [Line Items] | |
| Capital contributions reserves | $ 879.9 |
| Aspen UK | |
| Statutory Accounting Practices [Line Items] | |
| Dividend payment made without regulatory approval | 727.0 |
| AUL | |
| Statutory Accounting Practices [Line Items] | |
| Dividend payment made without regulatory approval | 17.0 |
| Syndicate to maintain funds at Lloyd | 1,194.7 |
| Total funds held by AUL | 1,125.9 |
| Bermuda | |
| Statutory Accounting Practices [Line Items] | |
| Dividend payment made without regulatory approval | $ 312.9 |
| Statutory capital and surplus, percent | 25.00% |
| Statutory capital and surplus, percent reduction requiring approval | 25.00% |
| Percent warning level of amount of enhanced capital required from statutory capital and surplus | 120.00% |
| Bermuda | AUL | |
| Statutory Accounting Practices [Line Items] | |
| Total funds held by AUL | $ 450.4 |