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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2020
Insurance [Abstract]  
Summary of External Reinsurance Transactions with State Auto Mutual Under Pooling Arrangement
The following table sets forth a summary of the Company’s external reinsurance transactions, as well as reinsurance transactions with State Auto Mutual under the Pooling Arrangement, for the three months ended March 31, 2020 and 2019:
($ millions)
Three months ended March 31
 
2020
 
2019
Premiums earned:
 
 
 
Assumed from external insurers and reinsurers
$
20.6

 
$
18.2

Assumed under Pooling Arrangement
330.5

 
302.7

Ceded to external insurers and reinsurers
(10.6
)
 
(5.9
)
Ceded under Pooling Arrangement
(272.2
)
 
(243.0
)
Net assumed premiums earned
$
68.3

 
$
72.0

Losses and loss expenses incurred:
 
 
 
Assumed from external insurers and reinsurers
$
11.7

 
$
14.2

Assumed under Pooling Arrangement
239.4

 
200.2

Ceded to external insurers and reinsurers
(33.5
)
 
(0.6
)
Ceded under Pooling Arrangement
(228.5
)
 
(143.8
)
Net assumed losses and loss expenses incurred
$
(10.9
)
 
$
70.0