Supplemental Insurance Information

12 Months Ended

Dec. 31, 2019

Supplementary Insurance Information [Abstract]

Supplemental Insurance Information

Schedule III – Supplemental Insurance Information

ALLEGHANY CORPORATION AND SUBSIDIARIES

		At December 31,								For the Year Ended December 31,
Year	Segment	Deferred Policy Acquisition Costs		Future Policy Benefits, Losses, Claims and Loss Expenses		Unearned Premiums		Other Policy Claims and Benefits Payable		Premium Revenue		Net Investment Income		Benefits, Claims, Losses and Settlement Expenses		Amortization of Deferred Policy Acquisition Costs		Other Operating Expenses		Premiums Written
		($ in millions)
2019	Reinsurance	$	406.7	$	9,323.8	$	1,668.1	$	—	$	4,327.0	$	371.9	$	2,961.1	$	1,178.7	$	228.1	$	4,495.0
2018	Reinsurance	$	361.2	$	9,442.2	$	1,523.9	$	—	$	3,939.0	$	327.0	$	2,869.3	$	1,075.9	$	206.4	$	3,969.1
2017	Reinsurance	$	355.9	$	9,128.0	$	1,503.6	$	—	$	3,808.7	$	312.0	$	2,785.4	$	1,074.3	$	212.4	$	3,810.1
2019	Insurance	$	115.9	$	2,670.3	$	910.1	$	—	$	1,151.1	$	161.3	$	725.3	$	214.1	$	137.8	$	1,256.7
2018	Insurance	$	103.3	$	2,874.9	$	754.2	$	—	$	1,037.2	$	153.9	$	651.1	$	195.5	$	139.4	$	1,079.3
2017	Insurance	$	97.4	$	2,811.1	$	689.0	$	—	$	1,146.3	$	122.6	$	834.8	$	187.4	$	177.1	$	1,155.8