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Deferred Acquisition Costs (Tables)
 12 Months Ended
Dec. 31, 2013
Deferred Acquisition Costs  
Deferred Acquisition Costs Rollforward (Table)

 

 
   For the year ended
December 31,		  
 
   2013   2012   2011  
 
   (in millions)
  

Balance at beginning of year

   $ 2,590.0   $ 2,358.1   $ 2,442.2  

Cost deferred during the year

     447.0     428.9     344.4  

Amortized to expense during the year (1)

     (187.1 )   (94.9 )   (271.4 )

Adjustment related to unrealized gains on available-for-sale securities and derivative instruments

     227.1     (102.1 )   (157.1 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at end of year

   $ 3,077.0   $ 2,590.0   $ 2,358.1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
(1)
Includes adjustments for revisions to estimated gross profits.