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SCHEDULE IV - REINSURANCE
 12 Months Ended
Dec. 31, 2016
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
SCHEDULE IV - REINSURANCE SCHEDULE IV – REINSURANCE

Years Ended December 31, 2016, 2015 and 2014
 
($ million, except percentages)
 
 
 
Ceded to
 
Assumed 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,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
$
840.6

 
$
25.6

 
$
819.9

 
$
4.9

 
$
1,291.9

 
$
1,291.9

 
0.4
%
2015
 
863.1

 
34.7

 
832.9

 
4.5

 
1,270.5

 
1,270.5

 
0.4
%
2014
 
882.6

 
25.3

 
861.7

 
4.4

 
1,074.1

 
1,074.1

 
0.4
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
These columns include the effect of intercompany pooling.
(2)
Calculated as earned premiums assumed from outside companies to net amount.