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Liability for Unpaid Claims and Claim Adjustment Expenses (Tables)
12 Months Ended
Dec. 31, 2019
Insurance [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
Changes in the liability for unpaid claims and claim adjustment expenses are as follows:

201920182017
(in millions of dollars)
Balance at January 1$23,149.0  $23,222.0  $23,249.5  
   Less Reinsurance Recoverable2,227.3  2,182.0  2,163.6  
Net Balance at January 120,921.7  21,040.0  21,085.9  
Incurred Related to
   Current Year6,113.2  5,832.3  5,422.9  
   Prior Years
      Interest1,036.5  1,049.8  1,089.7  
      All Other Incurred(274.1) (106.2) (158.2) 
      Foreign Currency76.0  (110.7) 167.5  
Total Incurred6,951.6  6,665.2  6,521.9  
Paid Related to
   Current Year(2,532.4) (2,354.7) (2,156.9) 
   Prior Years(4,511.0) (4,428.8) (4,410.9) 
Total Paid(7,043.4) (6,783.5) (6,567.8) 
Net Balance at December 3120,829.9  20,921.7  21,040.0  
   Plus Reinsurance Recoverable2,246.8  2,227.3  2,182.0  
Balance at December 31$23,076.7  $23,149.0  $23,222.0  
Reconciliation of Policy and Contract Benefits and Reserves for Future Policy and Contract Benefits to Balance Sheet Amounts
A reconciliation of policy and contract benefits and reserves for future policy and contract benefits as reported in our consolidated balance sheets to the liability for unpaid claims and claim adjustment expenses is as follows:

December 31
201920182017
(in millions of dollars)
Policy and Contract Benefits$1,745.5  $1,695.7  $1,605.2  
Reserves for Future Policy and Contract Benefits47,780.1  44,841.9  45,601.6  
Total49,525.6  46,537.6  47,206.8  
Less:
   Life Reserves for Future Policy and Contract Benefits8,435.7  8,330.9  8,231.3  
   Accident and Health Active Life Reserves12,210.1  11,837.4  10,658.8  
Adjustment Related to Unrealized Investment Gains and Losses5,803.1  3,220.3  5,094.7  
Liability for Unpaid Claims and Claim Adjustment Expenses$23,076.7  $23,149.0  $23,222.0  
The adjustment related to unrealized investment gains and losses reflects the changes that would be necessary to policyholder liabilities if the unrealized investment gains and losses related to the corresponding available-for-sale securities had been realized. Changes in this adjustment are reported as a component of other comprehensive income or loss.