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Schedule IV - Reinsurance Premiums Written and Premiums Earned (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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]          
Direct $ 1,249.5 $ 1,305.7 $ 2,531.7 $ 2,341.4 $ 2,042.1
Assumed 875.7 1,045.6 1,807.0 1,597.0 1,656.4
Ceded (774.7) (845.2) (1,442.7) (1,350.7) (1,120.7)
Net written premiums 1,350.5 1,506.1 2,896.0 2,587.7 2,577.8
Gross Amount 1,203.6 1,171.5 2,370.8 2,139.1 2,026.4
Assumed From Other Companies 755.7 776.9 1,617.2 1,479.2 1,612.0
Ceded (671.9) (621.2) (1,299.3) (1,207.8) (1,110.9)
Net premiums earned 1,287.4 1,327.2 $ 2,688.7 $ 2,410.5 $ 2,527.5
Percentage of Amount Assumed to Net     60.10% 61.40% 63.80%
Gross written premiums $ 2,125.2 $ 2,351.3 $ 4,338.7 $ 3,938.4 $ 3,698.5