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Related Party Disclosures (Tables)
3 Months Ended
Mar. 31, 2021
Reinsurance Disclosures [Abstract]  
Effects of Reinsurance The following table summarizes the effects of reinsurance on written and earned premiums and on losses and LAE for Ark.

Three Months Ended March 31, 2021
Millions
Written premiums:
Gross$404.5 
Ceded(62.1)
Net written premiums$342.4 
Earned premiums:
Gross$162.6 
Ceded(58.0)
Net earned premiums$104.6 
Losses and LAE:
Gross$115.6 
Ceded(49.6)
Net Losses and LAE$66.0