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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
Schedule IV - Reinsurance
SCHEDULE IV - REINSURANCE
For the Twelve Months Ended December 31, 2023, 2022 and 2021

Premiums Written
 
Direct 
Assumed
Ceded 
Net Amount
 ($ in millions)
2023$2,446.6 $1,521.0 $(1,385.7)$2,581.9 
2022$2,531.7 $1,807.0 $(1,442.7)$2,896.0 
2021$2,341.4 $1,597.0 $(1,350.7)$2,587.7 

Premiums Earned
 Gross Amount
Assumed From
Other
Companies
Ceded to Other
Companies
Net Amount
Percentage of
Amount
Assumed
to Net
 ($ in millions, except for percentages)
2023$2,444.8 $1,562.0 $(1,392.3)$2,614.5 59.7 %
2022$2,370.8 $1,617.2 $(1,299.3)$2,688.7 60.1 %
2021$2,139.1 $1,479.2 $(1,207.8)$2,410.5 61.4 %