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Organization, Consolidation and Presentation of Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Premium Receivable, Allowance for Credit Loss
The following table summarizes changes in our allowance for credit loss exposure on our premium receivables:
(millions)Three Months Ended September 30, 2020Nine Months Ended September 30, 2020
Allowance for credit loss, beginning of period$437.9 $283.2 
       Increase (decrease) in allowance1
(3.6)362.9 
       Write-offs2
(121.1)(332.9)
Allowance for credit loss, end of period$313.2 $313.2 
1Represents the incremental period increase (decrease) in other underwriting expenses.
2Represents portion of allowance that is reversed when premium receivables are written off.
Assets and Liabilities, Lessee
The following table summarizes the carrying amounts of our operating leased assets and liabilities:
(millions)September 30, 2020September 30, 2019December 31, 2019
Operating lease assets$174.1 $190.5 $188.2 
Operating lease liabilities186.2 204.1 201.5