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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2018
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 and nine months ended September 30, 2018 and 2017:
($ millions)
Three months ended September 30
 
Nine months ended September 30
 
2018
 
2017
 
2018
 
2017
Premiums earned:
 
 
 
 
 
 
 
Assumed from external insurers and reinsurers
$
17.3

 
$
2.3

 
$
41.9

 
$
4.7

Assumed under Pooling Arrangement
306.8

 
319.0

 
929.2

 
957.2

Ceded to external insurers and reinsurers
(5.9
)
 
(4.9
)
 
(16.7
)
 
(17.1
)
Ceded under Pooling Arrangement
(234.9
)
 
(203.7
)
 
(678.1
)
 
(608.2
)
Net assumed premiums earned
$
83.3

 
$
112.7

 
$
276.3

 
$
336.6

Losses and loss expenses incurred:
 
 
 
 
 
 
 
Assumed from external insurers and reinsurers
$
10.9

 
$
2.2

 
$
34.2

 
$
4.7

Assumed under Pooling Arrangement
183.1

 
254.0

 
591.4

 
719.5

Ceded to external insurers and reinsurers
(1.9
)
 
(2.7
)
 
(3.4
)
 
(3.7
)
Ceded under Pooling Arrangement
(148.4
)
 
(125.1
)
 
(486.0
)
 
(420.7
)
Net assumed losses and loss expenses incurred
$
43.7

 
$
128.4

 
$
136.3

 
$
299.8