Loss and Loss Adjustment Expense Reserves (Tables)

6 Months Ended

Jun. 30, 2021

Loss and Loss Adjustment Expenses Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense

Activity in the loss and loss adjustment expense reserves is summarized as follows:

	June 30,
(millions)	2021		2020
Balance at January 1	$	20,265.8	$	18,105.4
Less reinsurance recoverables on unpaid losses	3,798.2		3,212.2
Net balance at January 1	16,467.6		14,893.2
Net loss and loss adjustment reserve acquired1	732.5		0
Total beginning reserves	17,200.1		14,893.2
Incurred related to:
Current year	15,319.9		11,360.5
Prior years	197.0		116.1
Total incurred	15,516.9		11,476.6
Paid related to:
Current year	7,849.6		6,180.4
Prior years	5,436.7		5,180.1
Total paid	13,286.3		11,360.5
Net balance at June 30	19,430.7		15,009.3
Plus reinsurance recoverables on unpaid losses	4,464.9		3,502.7
Balance at June 30	$	23,895.6	$	18,512.0

1 Net reserves acquired in Protective Insurance acquisition.