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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
Schedule IV - Reinsurance
SCHEDULE IV - REINSURANCE
For the Twelve Months Ended December 31, 2022, 2021 and 2020
Premiums Written
Direct AssumedCeded Net Amount
($ in millions)
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 
2020$2,042.1 $1,656.4 $(1,120.7)$2,577.8 
Premiums Earned
Gross AmountAssumed From
Other
Companies
Ceded to Other
Companies
Net Amount
Percentage of
Amount
Assumed
to Net
($ in millions, except for percentages)
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 %
2020$2,026.4 $1,612.0 $(1,110.9)$2,527.5 63.8 %