Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2022

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 premiums receivable:

	Three Months				Six Months
Periods Ended June 30,	2022		2021		2022		2021
(millions)
Allowance for credit losses, beginning of period	$	276.2	$	265.3	$	280.4	$	356.2
Allowance acquired during period1	0		3.5		0		3.5
Increase in allowance2	95.8		87.4		189.7		148.3
Write-offs3	(106.2)		(111.0)		(204.3)		(262.8)
Allowance for credit losses, end of period	$	265.8	$	245.2	$	265.8	$	245.2

1 Represents the amount of the allowance acquired in the Protective Insurance Corporation and subsidiaries (Protective Insurance) acquisition.

2 Represents the incremental increase in other underwriting expenses.

3 Represents portion of allowance that is reversed when premiums receivable are written off.