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Deferred Costs, Capitalized, Prepaid, and Other Assets
 12 Months Ended
Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Deferred Policy Acquisition Costs DEFERRED POLICY ACQUISITION COSTS
The following table presents the balances and changes in Deferred Policy Acquisition Costs for the Property and Casualty and Life and Health business for the years ended December 31, 2023, 2022 and 2021:
DOLLARS IN MILLIONSDec 31, 2023Dec 31, 2022Dec 31, 2021
Property and CasualtyLife and HealthTotalProperty and CasualtyLife and HealthTotalProperty and CasualtyLife and HealthTotal
Balance, Beginning of Year$231.1 $404.5 $635.6 $268.7 $419.3 $688.0 $229.1 $381.3 $610.4 
 Capitalizations505.6 57.7 563.3 630.9 60.6 691.5 697.0 75.6 772.6 
 Amortization Expense (571.8)(19.9)(591.7)(668.5)(28.0)(696.5)(657.4)(35.7)(693.1)
 Experience Adjustment— (15.6)(15.6)— (8.7)(8.7)— (1.9)(1.9)
Balance164.9 426.7 591.6 231.1 443.2 674.3 268.7 419.3 688.0 
Less:
Deferred Policy Acquisition Costs Asset Divested— — — — 38.7 38.7 — — — 
Balance, End of Period$164.9 $426.7 $591.6 $231.1 $404.5 $635.6 $268.7 $419.3 $688.0 
Costs directly associated with the successful acquisition of business, principally commissions and certain premium taxes and policy issuance costs, are deferred. Costs deferred on property and casualty insurance contracts are amortized over the period in which premiums are earned. Costs deferred on traditional life insurance products and other long-duration insurance contracts are amortized on a constant level basis over the expected life of the contracts in accordance with the assumptions used to estimate the liability for future policyholder benefits for nonparticipating traditional and limited-payment contracts. The underlying assumptions for deferred policy acquisition costs and the liability for future policyholder benefits were updated concurrently.
The Company made changes to future assumptions in the fourth quarter for the Life and Health business for both the years ended December 31, 2023 and 2022.