Investments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Schedule of Investments [Line Items]
Impairment (recoveries) losses on investments	$ (0.3)	$ 0.2	$ 0.6	$ 0.2
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Impairment (recoveries) losses on investments	1.5	$ 0.2	2.4	$ 0.2
Fixed Maturities Including Held For Sale [Member]
Schedule of Investments [Line Items]
Allowance for credit losses	2.2		2.2		$ 0.3
Mortgage Loans [Member]
Schedule of Investments [Line Items]
Impairment (recoveries) losses on investments	(1.8)		(1.8)
Allowance for credit losses	$ 5.2		$ 5.2		$ 7.1