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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
Schedule IV - Reinsurance
SCHEDULE IV - REINSURANCE
For the Twelve Months Ended December 31, 2020, 2019 and 2018

Premiums Written
 
Direct 
Assumed
Ceded 
Net Amount
 ($ in millions)
2020$2,042.8 $1,660.8 $(1,120.7)$2,582.9 
2019$1,956.9 $1,485.5 $(1,014.5)$2,427.9 
2018$1,951.2 $1,495.7 $(1,364.9)$2,082.0 

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)
2020$2,027.1 $1,616.4 $(1,110.9)$2,532.6 63.8 %
2019$1,927.5 $1,494.9 $(1,129.1)$2,293.3 65.2 %
2018$1,940.5 $1,593.9 $(1,319.7)$2,214.7 72.0 %