Supplemental Information Concerning Insurance Operations

12 Months Ended

Dec. 31, 2020

Supplemental Information For Property Casualty Insurance Underwriters [Abstract]

Supplemental Information Concerning Insurance Operations

SCHEDULE VI – Supplemental Information Concerning Insurance Operations

ALLEGHANY CORPORATION AND SUBSIDIARIES

		At December 31,								For the Year Ended December 31,
		Deferred Policy Acquisition		Reserves for Unpaid Claims and Claim Adjustment		Discount if Any Deducted, in Reserves for Unpaid Claims and Claim Adjustment		Unearned		Earned		Net Investment		Claims and Claim Adjustment Expenses Incurred Related to					Amortization of Deferred Policy Acquisition		Paid Claims and Claim Adjustment		Premiums
Year	Line of Business	Costs		Expenses		Expenses		Premiums		Premiums		Income		Current Year		Prior Year			Costs		Expenses		Written
		($ in millions)
2020	Property and Casualty Insurance	$	595.1	$	12,970.6	$	—	$	2,984.1	$	6,000.2	$	465.7	$	4,559.9	$	(220.8	)	$	1,457.0	$	3,503.5	$	6,344.4
2019	Property and Casualty Insurance	$	522.6	$	11,928.4	$	—	$	2,566.2	$	5,478.1	$	533.2	$	3,871.1	$	(184.7	)	$	1,392.8	$	3,724.5	$	5,751.7
2018	Property and Casualty Insurance	$	464.5	$	12,250.3	$	—	$	2,267.1	$	4,976.2	$	480.9	$	3,849.4	$	(329.0	)	$	1,271.4	$	3,257.9	$	5,048.4