Recent Acquisitions, Disposals & Other Transactions - Sale of Argo Seguros Brasil S.A. (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Argo Seguros Brasil S.A. R$ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Feb. 15, 2022 USD ($)	Feb. 15, 2022 BRL (R$)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration received from sale			$ 26.9	R$ 140
Loss on disposal	$ 33.8	$ 6.3
Location of loss on disposal	Net realized investment and other gains (losses)
Losses from the realization of historical foreign currency translation losses	$ 27.3