XML 81 R43.htm IDEA: XBRL DOCUMENT
v3.24.1

Reinsurance (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Reinsurance Disclosures [Abstract] |
Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses |
| Twelve Months Ended December 31,
| 2023 |  | 2022 |  | 2021
| ($ in millions)
Premiums written: |  |  |  |  |
Insurance | $ | 2,446.6 |  |  | $ | 2,531.7 |  |  | $ | 2,341.4 |
Reinsurance | 1,521.0 |  |  | 1,807.0 |  |  | 1,597.0 |
Ceded | (1,385.7) |  |  | (1,442.7) |  |  | (1,350.7) |
Net written premiums | $ | 2,581.9 |  |  | $ | 2,896.0 |  |  | $ | 2,587.7 |
Premiums earned: |  |  |  |  |
Insurance | $ | 2,444.8 |  |  | $ | 2,370.8 |  |  | $ | 2,139.1 |
Reinsurance | 1,562.0 |  |  | 1,617.2 |  |  | 1,479.2 |
Ceded | (1,392.3) |  |  | (1,299.3) |  |  | (1,207.8) |
Net earned premiums | $ | 2,614.5 |  |  | $ | 2,688.7 |  |  | $ | 2,410.5 |
Losses and loss adjustment expenses: |  |  |  |  |
Insurance | $ | 1,644.5 |  |  | $ | 1,574.2 |  |  | $ | 1,499.8 |
Reinsurance | 707.2 |  |  | 939.5 |  |  | 1,000.6 |
Ceded | (798.7) |  |  | (833.7) |  |  | (807.1) |
Losses and loss adjustment expenses | $ | 1,553.0 |  |  | $ | 1,680.0 |  |  | $ | 1,693.3 |

X
- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 + Details
Name: | us-gaap_EffectsOfReinsuranceTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration