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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2017
Reinsurance Disclosures [Abstract]  
Reinsurance Premiums for Insurance Companies
Reinsurance data is as follows:
 
Year Ended December 31
 
2017
 
2016
 
2015
 
(in millions of dollars)
Direct Premium Income
$
8,677.2

 
$
8,385.0

 
$
8,151.9

Reinsurance Assumed
230.0

 
236.3

 
202.8

Reinsurance Ceded
(310.1
)
 
(263.6
)
 
(272.3
)
Net Premium Income
$
8,597.1

 
$
8,357.7

 
$
8,082.4

 
 
 
 
 
 
Ceded Benefits and Change in Reserves for Future Benefits
$
655.4

 
$
648.3

 
$
662.7