Fair Values of Financial Instruments (Summary of unobservable inputs) (Details) - Fair Value, Inputs, Level 3 $ in Millions	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Non performance risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	$ 110.5	$ 123.7
Non performance risk | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	0.7	0.3
Non performance risk | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	1.9	1.1
Non performance risk | Weighted average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	1.3	0.6
Option budget | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	1.1	1.1
Option budget | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	4.5	3.4
Option budget | Weighted average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	2.6	2.4
Discount rates
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	$ 4.9	$ 4.9
Discount rates | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	17.5	17.5
Discount rates | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	19.5	19.5
Discount rates | Weighted average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	18.5	18.5
EBITDA Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	$ 3.8	$ 3.8
EBITDA Multiple | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	9.0	9.0
EBITDA Multiple | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	10.0	10.0
EBITDA Multiple | Weighted average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	100.0	100.0
Surrender rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	0.5	0.5
Surrender rate | Maximum | Base
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	15	15
Surrender rate | Maximum | Additional Shock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	30	30
Surrender rate | Weighted average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest sensitive contract liabilities, embedded derivative (as a percent)	8.2	7.7