Reinsurance (Cumulative Incurred Claims) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 178,900,000
Claims Reserve	$ 3,100,000
Cumulative Number Of Reported Claims	132,974
Incident Year - Four Years Prior [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 25,800,000	$ 25,800,000	$ 25,800,000	$ 25,700,000	$ 25,800,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	22,310
Incident Year - Three Years Prior [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 30,200,000	30,200,000	30,200,000	$ 30,100,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	24,422
Incident Year - Two Years Prior [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 37,700,000	37,600,000	$ 37,700,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	28,208
Incident Year - Prior Year [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 39,200,000	$ 38,900,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	28,829
Incident Year - Current Year [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 46,000,000.0
Claims Reserve	$ 3,100,000
Cumulative Number Of Reported Claims	29,205