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Basis of Presentation and Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Oct. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Amortization of acquisition costs for property and casualty contracts, first term |  |  | 6 months |  |  |
Amortization of acquisition costs for property and casualty contracts, second term |  |  | 12 months |  |  |
Amortization of acquisition costs for supplemental policies |  |  | 7 years |  |  |
Amortization term for acquisition costs of annuity contracts |  |  | 20 years |  |  |
Amortization period of acquisition costs of interest sensitive life contracts |  |  | 20 years |  |  |
Amortization term for acquisition costs of indexed universal life contracts |  |  | 30 years |  |  |
Amortization of acquisition costs for individual life contracts, first term |  |  | 10 years |  |  |
Amortization of acquisition costs for individual life contracts, second term |  |  | 15 years |  |  |
Amortization of acquisition costs for individual life contracts, third term |  |  | 20 years |  |  |
Amortization of acquisition costs for individual life contracts, fourth term |  |  | 30 years |  |  |
Percentage of reversion to mean approach utilized to amortized policy acquisition costs |  |  | 8.00% |  |  |
Deferred policy acquisition costs, corridor around the mean |  |  | 2.00% |  |  |
Amortization in 2022 |  |  | $ 12.1 |  |  |
Amortization in 2023 |  |  | 11.2 |  |  |
Amortization in 2024 |  |  | 10.5 |  |  |
Amortization in 2025 |  |  | 9.8 |  |  |
Amortization in 2026 |  |  | 9.2 |  |  |
Finite lived intangible asset |  |  | 134.6 |  |  |
Goodwill impairment |  |  | $ 0.0 |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  |  | 4.50% |  |  |
Principal Repayment On Federal Home Loan Bank Funding Agreements |  |  | $ 362.0 | $ 0.0 | $ 305.0 |
FHLB advances |  |  | $ 782.5 |  |  |
Weighted average fair value of nonvested options outstanding (in usd per share) |  |  | $ 6.80 |  |  |
Unrecognized share-based compensation expense, nonvested options |  |  | $ 2.0 |  |  |
Antidilutive securities exclude from EPS computation (in shares) |  |  | 734,018 | 734,018 | 734,018 | 734,018
Minimum exercise price (in usd per share) |  |  | $ 38.05 | $ 38.05 | $ 38.05 | $ 38.05
Maximum exercise price (in usd per share) |  |  | $ 42.95 | $ 42.95 | $ 42.95 | $ 42.95
Employee stock option |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Share-based compensation expense |  |  | $ 1.2 | $ 1.1 | $ 1.2 |
Restricted stock units |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Share-based compensation expense |  |  | 6.6 | 4.8 | 5.2 |
Unrecognized share-based compensation expense, equity instruments other than options |  |  | 6.6 |  |  |
HMLIC and NTA |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Proceeds from FHLB funding agreements |  |  | 554.0 |  |  |
Principal Repayment On Federal Home Loan Bank Funding Agreements |  |  | $ 362.0 |  |  |
HMIC |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, percentage, authorized |  |  | 15.00% |  |  |
Minimum | HMIC |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  |  | 2.00% |  |  |
Real estate property | Minimum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 20 years |  |  |
Real estate property | Maximum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 45 years |  |  |
Lease hold improvements and other property and equipment | Minimum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 3 years |  |  |
Lease hold improvements and other property and equipment | Maximum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 10 years |  |  |
BCG |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Impairment charges of intangible assets | $ 4.4 |  |  |  |  |
Goodwill impairment | $ 5.6 | $ 5.6 |  |  |  |
Value of business acquired |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Consideration to acquire business |  |  | $ 76.9 |  |  |
Amortization in 2022 |  |  | 6.2 |  |  |
Amortization in 2023 |  |  | 5.8 |  |  |
Amortization in 2024 |  |  | 5.4 |  |  |
Amortization in 2025 |  |  | 5.1 |  |  |
Amortization in 2026 |  |  | 4.7 |  |  |
Value of distribution acquired | NTA |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Amortization in 2022 |  |  | 2.9 |  |  |
Amortization in 2023 |  |  | 2.9 |  |  |
Amortization in 2024 |  |  | 2.9 |  |  |
Amortization in 2025 |  |  | 2.9 |  |  |
Amortization in 2026 |  |  | 2.9 |  |  |
Finite lived intangible asset |  |  | 41.8 |  |  |
Value of distribution acquired | BCG |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Amortization in 2022 |  |  | 0.3 |  |  |
Amortization in 2023 |  |  | 0.3 |  |  |
Amortization in 2024 |  |  | 0.3 |  |  |
Amortization in 2025 |  |  | 0.3 |  |  |
Amortization in 2026 |  |  | 0.3 |  |  |
Finite lived intangible asset |  |  | 0.6 |  |  |
Value of agency relationships | NTA |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Amortization in 2022 |  |  | 1.9 |  |  |
Amortization in 2023 |  |  | 1.6 |  |  |
Amortization in 2024 |  |  | 1.4 |  |  |
Amortization in 2025 |  |  | 1.2 |  |  |
Amortization in 2026 |  |  | 1.0 |  |  |
Value of agency relationship |  |  | 10.7 |  |  |
Value of customer relationships | BCG |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Amortization in 2022 |  |  | 1.1 |  |  |
Amortization in 2023 |  |  | 0.9 |  |  |
Amortization in 2024 |  |  | 0.7 |  |  |
Amortization in 2025 |  |  | 0.6 |  |  |
Amortization in 2026 |  |  | 0.5 |  |  |
Value of customer relationship |  |  | 4.6 |  |  |
Interest sensitive life contracts |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative |  |  |  |  |  |
Deferred policy acquisition costs, impact of unrealized investment gains (losses) |  |  | $ 71.9 | $ 90.5 | $ 41.2 |

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