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SCHEDULE IV - REINSURANCE
12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
SCHEDULE IV - REINSURANCE
STATE AUTO FINANCIAL CORPORATION AND SUBSIDIARIES
SCHEDULE IV – REINSURANCE

Years Ended December 31, 2018, 2017 and 2016 
($ million, except percentages)Ceded toAssumed from
Gross
Amount 
Unaffiliated
Companies 
Affiliated Companies(1)
Unaffiliated
Companies 
Affiliated Companies(1)
Net
Amount 
Percentage of amount assumed to net (2)
Property-casualty
earned premiums for
year ended December 31, 
2018$881.3 $22.6 $919.7 $61.0 $1,238.0 $1,238.0 4.9 %
2017828.7 22.6 817.1 11.0 1,276.1 1,276.1 0.9 %
2016840.6 25.6 819.9 4.9 1,291.1 1,291.1 0.4 %
(1)These columns include the effect of intercompany pooling. 
(2)Calculated as earned premiums assumed from outside companies to net amount.