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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Summary of Deferred Policy Acquisition Cost Amortization and Net Advertising Expense
The table below presents a summary of deferred policy acquisition cost amortization and net advertising expense:
Year Ended December 31,
202320222021
(Amounts in millions)
Deferred policy acquisition cost amortization
$708.5 $654.6 $633.4 
Net advertising expense
8.9 11.8 50.1 
Effects of Reinsurance The effect of reinsurance on property and casualty premiums written and earned was as follows:
Year Ended December 31,
202320222021
 (Amounts in thousands)
Premiums Written
Direct $4,531,942 $4,018,057 $3,877,476 
Ceded(109,644)(81,256)(65,521)
Assumed15,353 10,743 13,361 
     Net$4,437,651 $3,947,544 $3,825,316 
Premiums Earned
Direct$4,339,333 $3,993,771 $3,764,626 
Ceded(109,445)(80,950)(65,017)
Assumed15,481 10,821 13,301 
     Net$4,245,369 $3,923,642 $3,712,910 
Premium Receivable, Allowance for Credit Loss
The following table presents a summary of changes in allowance for credit losses on premiums receivable:
 Year Ended December 31,
 202320222021
 
Beginning balance$5,800 $6,000 $10,000 
     Provision during the period for expected credit losses 2,819 4,213 (893)
Write-off amounts during the period(3,879)(5,027)(3,693)
Recoveries during the period of amounts previously written off 560 614 586 
Ending balance $5,300 $5,800 $6,000 
Reinsurance Recoverable, Allowance for Credit Loss
The following table presents a summary of changes in allowance for credit losses on reinsurance recoverables:

 Year Ended December 31,
 202320222021
 
Beginning balance$— $— $91 
     Provision during the period for expected credit losses 12 — (91)
Write-off amounts during the period— — — 
Recoveries during the period of amounts previously written off — — — 
Ending balance $12 $— $—