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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014 and 2013:
 
 
Three months ended September 30
 
Nine months ended September 30
 
($ millions)
2014
 
2013
 
2014
 
2013
 
Premiums earned:
 
 
 
 
 
 
 
 
Assumed from external insurers and reinsurers
$
1.2

 
$
1.2

 
$
3.3

 
$
2.7

 
Assumed under Pooling Arrangement
270.2

 
266.0

 
801.0

 
790.8

 
Ceded to external insurers and reinsurers
(6.5
)
 
(5.4
)
 
(18.5
)
 
(17.6
)
 
Ceded under Pooling Arrangement
(215.2
)
 
(215.2
)
 
(647.4
)
 
(639.0
)
 
Net assumed premiums earned
$
49.7

 
$
46.6

 
$
138.4

 
$
136.9

 
Losses and loss expenses incurred:
 
 
 
 
 
 
 
 
Assumed from external insurers and reinsurers
$
0.8

 
$
0.9

 
$
2.3

 
$
1.3

 
Assumed under Pooling Arrangement
185.2

 
179.5

 
548.9

 
540.1

 
Ceded to external insurers and reinsurers
(2.7
)
 
(0.8
)
 
(6.4
)
 
(4.9
)
 
Ceded under Pooling Arrangement
(131.6
)
 
(137.9
)
 
(417.3
)
 
(434.0
)
 
Net assumed losses and loss expenses incurred
$
51.7

 
$
41.7

 
$
127.5

 
$
102.5