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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
Schedule IV - Reinsurance
SCHEDULE IV - REINSURANCE
For the Twelve Months Ended December 31, 2018, 2017 and 2016

Premiums Written
 
 
Direct 
 
Assumed 
 
Ceded 
 
Net Amount
 
 
($ in millions)
2018
 
$
1,951.2

 
$
1,495.7

 
$
(1,364.9
)
 
$
2,082.0

2017
 
$
1,812.4

 
$
1,548.5

 
$
(1,148.4
)
 
$
2,212.5

2016
 
$
1,733.8

 
$
1,413.2

 
$
(553.3
)
 
$
2,593.7


Premiums Earned
 
 
 
Gross Amount
 
Ceded to Other
Companies
 
Assumed From
Other
Companies
 
Net Amount
 
Percentage of
Amount
Assumed
to Net
 
 
($ in millions, except for percentages)
2018
 
$
1,940.5

 
$
(1,319.7
)
 
$
1,593.9

 
$
2,214.7

 
72.0
%
2017
 
$
1,757.4

 
$
(902.6
)
 
$
1,451.8

 
$
2,306.6

 
62.9
%
2016
 
$
1,768.4

 
$
(449.0
)
 
$
1,317.9

 
$
2,637.3

 
50.0
%