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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Policy Acquisition Costs      $ 319.0 $ 290.8 $ 306.6  
Net Reserves for Losses and LAE  $ 3,082.9 $ 2,505.3 2,813.2 4,313.7 3,970.1 $ 4,632.0
Net Reserves for Unearned Premiums     1,720.2 1,516.2 1,363.7  
Net earned premiums 1,287.4 1,327.2 2,688.7 2,410.5 2,527.5  
Net Investment Income      188.1 147.5 154.6  
Losses and LAE Expenses      1,680.0 1,693.3 1,840.8  
Policy Acquisition Expenses      431.8 414.1 465.7  
Net written premiums $ 1,350.5 $ 1,506.1 2,896.0 2,587.7 2,577.8  
General and Administrative Expenses      386.5 333.1 308.0  
Reinsurance            
Deferred Policy Acquisition Costs      227.2 205.2 206.8  
Net Reserves for Losses and LAE      1,360.7 2,148.4 2,095.7  
Net Reserves for Unearned Premiums     862.4 688.6 617.6  
Net earned premiums     1,251.8 1,118.8 1,287.7  
Losses and LAE Expenses      770.3 705.2 958.6  
Policy Acquisition Expenses      252.4 221.6 246.0  
Net written premiums     1,426.4 1,199.0 1,297.7  
General and Administrative Expenses      142.5 121.3 110.8  
Insurance            
Deferred Policy Acquisition Costs      91.8 85.6 99.8  
Net Reserves for Losses and LAE      1,452.5 2,165.3 1,874.4  
Net Reserves for Unearned Premiums     857.8 827.6 746.1  
Net earned premiums     1,436.9 1,291.7 1,239.8  
Losses and LAE Expenses      909.7 988.1 882.2  
Policy Acquisition Expenses      179.4 192.5 219.7  
Net written premiums     1,469.6 1,388.7 1,280.1  
General and Administrative Expenses      $ 244.0 $ 211.8 $ 197.2