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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2012
Reinsurance Disclosures [Abstract]  
Reinsurance Premiums for Insurance Companies by Product Segment Table [Text Block]
Reinsurance data is as follows:
 
Year Ended December 31
 
2012
 
2011
 
2010
 
(in millions of dollars)
Direct Premium Income
$
7,736.0

 
$
7,521.5

 
$
7,434.3

Reinsurance Assumed
210.9

 
216.6

 
241.3

Reinsurance Ceded
(230.8
)
 
(223.9
)
 
(244.2
)
Net Premium Income
$
7,716.1

 
$
7,514.2

 
$
7,431.4

 
 
 
 
 
 
Ceded Benefits and Change in Reserves for Future Benefits
$
591.7

 
$
609.2

 
$
602.2