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Unpaid Claims and Claim Expenses - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Liability for Catastrophe Claims [Line Items]
Favorable development of total reserves for property and casualty claims occurring in prior years	$ 9.2	$ 7.5
Automobile and homeowners loss
Liability for Catastrophe Claims [Line Items]
Favorable development of total reserves for property and casualty claims occurring in prior years	4.0
2018 Camp Fire in California
Liability for Catastrophe Claims [Line Items]
Favorable development of total reserves for property and casualty claims occurring in prior years	$ 5.2