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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
Schedule IV - Reinsurance
SCHEDULE IV - REINSURANCE
For the Twelve Months Ended December 31, 2024, 2023 and 2022
Premiums Written
 
Direct 
Assumed
Ceded 
Net Amount
 ($ in millions)
2024$2,723.5 $1,885.8 $(1,666.7)$2,942.6 
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 

Premiums Earned
 Gross Amount
Assumed From Other Companies
Ceded to Other Companies
Net Amount
Percentage of Amount Assumed to Net Amount
 ($ in millions, except for percentages)
2024$2,565.7 $1,822.1 $(1,498.1)$2,889.7 63.1 %
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 %