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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financial Assets
Total fixed maturity securities	$ 5,350.0	$ 5,185.0
Equity securities	98.8	99.6
Mortgage-backed securities
Financial Assets
Total fixed maturity securities	584.0	570.4
Other, including U.S. Treasury securities
Financial Assets
Total fixed maturity securities	365.0	342.7
Municipal bonds
Financial Assets
Total fixed maturity securities	1,290.8	1,269.7
Foreign government bonds
Financial Assets
Total fixed maturity securities	32.6	33.5
Corporate bonds
Financial Assets
Total fixed maturity securities	1,943.5	1,901.7
Other asset-backed securities
Financial Assets
Total fixed maturity securities	1,134.1	1,067.0
Carrying Amount | Recurring
Financial Assets
Total fixed maturity securities	5,350.0	5,185.0
Equity securities	98.8	99.6
Short-term investments	75.0	109.4
Other investments	41.8	38.6
Totals	5,565.6	5,432.6
Separate Account variable annuity assets	2,954.7	2,792.3
Financial Liabilities
Investment contract and future policy benefit reserves, embedded derivatives	1.7	1.2
Other policyholder funds, embedded derivatives	89.9	91.0
Carrying Amount | Recurring | Mortgage-backed securities
Financial Assets
Total fixed maturity securities	584.0	570.4
Carrying Amount | Recurring | Other, including U.S. Treasury securities
Financial Assets
Total fixed maturity securities	364.8	342.6
Carrying Amount | Recurring | Municipal bonds
Financial Assets
Total fixed maturity securities	1,290.9	1,269.7
Carrying Amount | Recurring | Foreign government bonds
Financial Assets
Total fixed maturity securities	32.6	33.6
Carrying Amount | Recurring | Corporate bonds
Financial Assets
Total fixed maturity securities	1,943.5	1,901.7
Carrying Amount | Recurring | Other asset-backed securities
Financial Assets
Total fixed maturity securities	1,134.2	1,067.0
Fair Value | Recurring
Financial Assets
Total fixed maturity securities	5,350.0	5,185.0
Equity securities	98.8	99.6
Short-term investments	75.0	109.4
Other investments	41.8	38.6
Totals	5,565.6	5,432.6
Separate Account variable annuity assets	2,954.7	2,792.3
Financial Liabilities
Investment contract and future policy benefit reserves, embedded derivatives	1.7	1.2
Other policyholder funds, embedded derivatives	89.9	91.0
Fair Value | Recurring | Level 1
Financial Assets
Total fixed maturity securities	51.7	36.8
Equity securities	24.3	23.3
Short-term investments	75.0	109.4
Other investments	0.0	0.0
Totals	151.0	169.5
Separate Account variable annuity assets	2,954.7	2,792.3
Financial Liabilities
Investment contract and future policy benefit reserves, embedded derivatives	0.0	0.0
Other policyholder funds, embedded derivatives	0.0	0.0
Fair Value | Recurring | Level 2
Financial Assets
Total fixed maturity securities	4,854.3	4,724.9
Equity securities	72.5	74.3
Short-term investments	0.0	0.0
Other investments	41.8	38.6
Totals	4,968.6	4,837.8
Separate Account variable annuity assets	0.0	0.0
Financial Liabilities
Investment contract and future policy benefit reserves, embedded derivatives	1.7	1.2
Other policyholder funds, embedded derivatives	0.0	0.0
Fair Value | Recurring | Level 3
Financial Assets
Total fixed maturity securities	444.0	423.3
Equity securities	2.0	2.0
Short-term investments	0.0	0.0
Other investments	0.0	0.0
Totals	446.0	425.3
Separate Account variable annuity assets	0.0	0.0
Financial Liabilities
Investment contract and future policy benefit reserves, embedded derivatives	0.0	0.0
Other policyholder funds, embedded derivatives	89.9	91.0
Fair Value | Recurring | Mortgage-backed securities
Financial Assets
Total fixed maturity securities	584.0	570.4
Fair Value | Recurring | Mortgage-backed securities | Level 1
Financial Assets
Total fixed maturity securities	0.0	0.0
Fair Value | Recurring | Mortgage-backed securities | Level 2
Financial Assets
Total fixed maturity securities	581.4	567.8
Fair Value | Recurring | Mortgage-backed securities | Level 3
Financial Assets
Total fixed maturity securities	2.6	2.6
Fair Value | Recurring | Other, including U.S. Treasury securities
Financial Assets
Total fixed maturity securities	364.8	342.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 1
Financial Assets
Total fixed maturity securities	38.5	24.6
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 2
Financial Assets
Total fixed maturity securities	326.3	318.0
Fair Value | Recurring | Other, including U.S. Treasury securities | Level 3
Financial Assets
Total fixed maturity securities	0.0	0.0
Fair Value | Recurring | Municipal bonds
Financial Assets
Total fixed maturity securities	1,290.9	1,269.7
Fair Value | Recurring | Municipal bonds | Level 1
Financial Assets
Total fixed maturity securities	0.0	0.0
Fair Value | Recurring | Municipal bonds | Level 2
Financial Assets
Total fixed maturity securities	1,235.5	1,215.3
Fair Value | Recurring | Municipal bonds | Level 3
Financial Assets
Total fixed maturity securities	55.4	54.4
Fair Value | Recurring | Foreign government bonds
Financial Assets
Total fixed maturity securities	32.6	33.6
Fair Value | Recurring | Foreign government bonds | Level 1
Financial Assets
Total fixed maturity securities	0.0	0.0
Fair Value | Recurring | Foreign government bonds | Level 2
Financial Assets
Total fixed maturity securities	32.6	33.6
Fair Value | Recurring | Foreign government bonds | Level 3
Financial Assets
Total fixed maturity securities	0.0	0.0
Fair Value | Recurring | Corporate bonds
Financial Assets
Total fixed maturity securities	1,943.5	1,901.7
Fair Value | Recurring | Corporate bonds | Level 1
Financial Assets
Total fixed maturity securities	13.2	12.2
Fair Value | Recurring | Corporate bonds | Level 2
Financial Assets
Total fixed maturity securities	1,646.3	1,628.2
Fair Value | Recurring | Corporate bonds | Level 3
Financial Assets
Total fixed maturity securities	284.0	261.3
Fair Value | Recurring | Other asset-backed securities
Financial Assets
Total fixed maturity securities	1,134.2	1,067.0
Fair Value | Recurring | Other asset-backed securities | Level 1
Financial Assets
Total fixed maturity securities	0.0	0.0
Fair Value | Recurring | Other asset-backed securities | Level 2
Financial Assets
Total fixed maturity securities	1,032.2	962.0
Fair Value | Recurring | Other asset-backed securities | Level 3
Financial Assets
Total fixed maturity securities	$ 102.0	$ 105.0

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