Other assets (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] | ||
| Net deferred tax assets | $ 78.9 | $ 77.8 |
| Commission income receivable | 50.7 | 45.1 |
| Funds withheld by reinsurers | 18.1 | 19.3 |
| Prepaid expenses | 20.6 | 16.4 |
| Current income tax recoverable | 31.9 | 9.3 |
| Other | 34.0 | 30.2 |
| Total | $ 234.2 | $ 198.1 |
| X | ||||||||||
- Definition Commission Income Receivable No definition available.
|
| X | ||||||||||
- Definition Funds Withheld By Reinsurers No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of other miscellaneous assets. No definition available.
|
| X | ||||||||||
- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets. No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|