LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Schedule of Reserve Balance (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] | ||||||
| Gross loss and LAE reserves, January 1 | $ 483.6 | $ 413.2 | ||||
| Reinsurance recoverable on unpaid losses | (25.4) | (48.0) | ||||
| Net loss and LAE reserves, January 1 | $ 470.3 | $ 408.5 | 470.3 | 408.5 | $ 458.2 | $ 365.2 |
| Net incurred loss and LAE related to: | ||||||
| Current year | 494.6 | 452.9 | ||||
| Prior years | (28.5) | (14.0) | ||||
| Net losses and LAE incurred | 239.9 | 233.3 | 466.1 | 438.9 | ||
| Net paid loss and LAE related to: | ||||||
| Current year | 222.4 | 205.9 | ||||
| Prior years | 231.6 | 189.7 | ||||
| Total paid | 454.0 | 395.6 | ||||
| Net loss and LAE reserves, June 30 | 470.3 | 408.5 | 470.3 | 408.5 | ||
| Plus reinsurance recoverable on unpaid losses | 18.9 | 36.0 | 18.9 | 36.0 | ||
| Gross loss and LAE reserves, June 30 | $ 489.2 | $ 444.5 | $ 489.2 | $ 444.5 | ||
| X | ||||||||||
- Definition Liability For Claims And Claims Adjustment Expense, Gross No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|