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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2016
Reinsurance Disclosures [Abstract]  
Reinsurance Premiums for Insurance Companies
Reinsurance data is as follows:
 
Year Ended December 31
 
2016
 
2015
 
2014
 
(in millions of dollars)
Direct Premium Income
$
8,385.0

 
$
8,151.9

 
$
7,899.3

Reinsurance Assumed
236.3

 
202.8

 
189.8

Reinsurance Ceded
(263.6
)
 
(272.3
)
 
(291.9
)
Net Premium Income
$
8,357.7

 
$
8,082.4

 
$
7,797.2

 
 
 
 
 
 
Ceded Benefits and Change in Reserves for Future Benefits
$
648.3

 
$
662.7

 
$
662.7