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Reinsurance (Tables)

12 Months Ended

Dec. 31, 2023

Reinsurance Disclosures [Abstract]

Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses


			Twelve Months Ended December 31,
			2023						2022						2021
			($ in millions)
Premiums written:
Insurance			$	2,446.6					$	2,531.7					$	2,341.4
Reinsurance			1,521.0						1,807.0						1,597.0
Ceded			(1,385.7)						(1,442.7)						(1,350.7)
Net written premiums			$	2,581.9					$	2,896.0					$	2,587.7

Premiums earned:
Insurance			$	2,444.8					$	2,370.8					$	2,139.1
Reinsurance			1,562.0						1,617.2						1,479.2
Ceded			(1,392.3)						(1,299.3)						(1,207.8)
Net earned premiums			$	2,614.5					$	2,688.7					$	2,410.5

Losses and loss adjustment expenses:
Insurance			$	1,644.5					$	1,574.2					$	1,499.8
Reinsurance			707.2						939.5						1,000.6
Ceded			(798.7)						(833.7)						(807.1)
Losses and loss adjustment expenses			$	1,553.0					$	1,680.0					$	1,693.3