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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
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,
202020192018
(Amounts in millions)
Deferred policy acquisition cost amortization
$627.8 $602.1 $572.2 
Net advertising expense
37.7 42.2 40.9 
Effects of Reinsurance The effect of reinsurance on property and casualty premiums written and earned was as follows:
Year Ended December 31,
202020192018
 (Amounts in thousands)
Premiums Written
Direct $3,624,965 $3,742,627 $3,524,186 
Ceded(50,630)(43,785)(55,973)
Assumed8,012 919 689 
     Net$3,582,347 $3,699,761 $3,468,902 
Premiums Earned
Direct$3,574,898 $3,626,857 $3,386,192 
Ceded(56,212)(56,725)(48,941)
Assumed8,067 910 665 
     Net$3,526,753 $3,571,042 $3,337,916 
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,
 202020192018
 
Beginning balance$1,445 $1,458 1,258 
     Cumulative effect of adopting ASU 2016-131,855 — — 
Beginning balance, as adjusted 3,300 1,458 1,258 
     Provision during the period for expected credit losses 10,294 6,162 6,463 
Write-off amounts during the period(4,406)(7,000)(6,908)
Recoveries during the period of amounts previously written off 812 825 645 
Ending balance $10,000 $1,445 $1,458 
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,
 202020192018
 
Beginning balance$— $— $— 
     Cumulative effect of adopting ASU 2016-13159 — — 
Beginning balance, as adjusted 159 — — 
     Provision during the period for expected credit losses (68)— — 
Write-off amounts during the period— — — 
Recoveries during the period of amounts previously written off — — — 
Ending balance$91 $— $—