Disposition (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
|
| Disposal Group, Including Discontinued Operations [Line Items] | |||||
| Reinsurance recoverable | $ 6,471.3 | $ 6,327.9 | $ 6,327.9 | ||
| Future policy benefits and expenses | 55.7 | 52.8 | 52.8 | ||
| Loss on sale of business | $ 0.5 | 10.7 | $ 0.5 | $ 0.0 | $ 11.2 |
| Disposal Group, Held-for-Sale, Not Discontinued Operations | |||||
| Disposal Group, Including Discontinued Operations [Line Items] | |||||
| Reinsurance recoverable | 489.4 | ||||
| Future policy benefits and expenses | $ 477.1 | ||||
| X | ||||||||||
- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. 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 Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|