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Basis of Presentation and Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2022 USD ($) | Jan. 01, 2021 USD ($) cohort | Oct. 01, 2020 USD ($) | Oct. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
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 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 |  |
Amortization of acquisition costs for supplemental and group benefits |  |  |  |  | 6 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% |  |
Purchase price |  |  |  |  | $ 171.8 |  |
Amortization in 2023 |  |  |  |  | 14.8 |  |
Amortization in 2024 |  |  |  |  | 14.6 |  |
Amortization in 2025 |  |  |  |  | 14.4 |  |
Amortization in 2026 |  |  |  |  | 14.3 |  |
Amortization in 2027 |  |  |  |  | 14.2 |  |
Goodwill impairment | $ 2.0 |  |  |  | $ 2.0 | $ 0.0 | $ 5.6
Reverse repurchase agreement, cash to value percentage |  |  |  |  | 95.00% |  |
Securities sold under agreements to repurchase |  |  |  |  | $ 70.2 | $ 0.0 |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  |  |  |  | 4.50% |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, percentage, authorized |  |  |  |  |  | 25.00% |
Principal repayment on FHLB funding agreements |  |  |  |  | $ 149.0 | $ 362.0 | 0.0
FHLB advances |  |  |  |  | 792.5 |  |
Share-based compensation expense |  |  |  |  | $ 6.9 | 6.6 | 4.8
Weighted average fair value of nonvested options outstanding (in usd per share) | $ / shares |  |  |  |  | $ 7.48 |  |
Unrecognized share-based compensation expense, nonvested options |  |  |  |  | $ 2.2 |  |
Antidilutive securities exclude from EPS computation (in shares) | shares |  |  |  |  | 992,404 |  |
Minimum exercise price (in usd per share) | $ / shares |  |  |  |  | $ 38.99 |  |
Maximum exercise price (in usd per share) | $ / shares |  |  |  |  | $ 42.95 |  |
Retained earnings |  |  |  |  | $ (1,468.6) | (1,524.9) |
Income before income taxes |  |  |  |  | (11.9) | 174.9 | 159.6
Accumulated other comprehensive income |  |  |  |  | 8.8 | 10.2 |
Impairment of infinite lived intangible assets |  |  |  |  | 0.3 |  |
Other comprehensive income (loss) |  |  |  |  | (646.2) | (74.6) | 135.5
Net income (loss) |  |  |  |  | (2.6) | 142.8 | 133.3
Fair Value |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Securities sold under agreements to repurchase |  |  |  |  | 73.9 | 0.0 |
Accounting Standards Update 2018-12 | Liability For Future Policy Benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Accumulated other comprehensive income (AOCI) |  | $ (499.3) |  |  |  |  |
Number of cohorts with net premium ratio capped | cohort |  | 5 |  |  |  |  |
Net premium ratio cap, percent |  | 100.00% |  |  |  |  |
Retained earnings |  | $ 0.2 |  |  |  |  |
Accounting Standards Update 2018-12 | Deferred Policy Acquisition Costs |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Accumulated other comprehensive income (AOCI) |  | 71.5 |  |  |  |  |
Accounting Standards Update 2018-12 | Market Risk Benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Accumulated other comprehensive income (AOCI) |  | (1.3) |  |  |  |  |
Retained earnings |  | $ 5.4 |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (2.6) | 142.8 | 133.3
Employee stock option |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 1.2 | 1.2 | 1.1
Restricted stock units |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Unrecognized share-based compensation expense, equity instruments other than options |  |  |  |  | 7.8 |  |
HMLIC and NTA |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Proceeds from FHLB funding agreements |  |  |  |  | 159.0 |  |
Principal repayment on FHLB funding agreements |  |  |  |  | $ 149.0 |  |
Minimum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  |  |  |  | 2.00% |  |
Minimum | Accounting Standards Update 2018-12 |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | $ 15.0 | 20.0 |
Minimum | Accounting Standards Update 2018-12 | Liability For Future Policy Benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 7.0 | 15.0 |
Minimum | Accounting Standards Update 2018-12 | Deferred Policy Acquisition Costs |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 8.0 | 3.0 |
Minimum | Accounting Standards Update 2018-12 | Market Risk Benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | (3.0) | (7.0) |
Net income (loss) |  |  |  |  | 0.0 | 2.0 |
Minimum | Accounting Standards Update 2018-12 | Measurement Input, Discount Rate |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | 7.0 | 15.0 |
Minimum | Accounting Standards Update 2018-12 | Deferred policy acquisition costs |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | 8.0 | 3.0 |
Minimum | Accounting Standards Update 2018-12 | Market risk benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | 0.0 | 2.0 |
Maximum | Accounting Standards Update 2018-12 |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | 31.0 | 35.0 |
Maximum | Accounting Standards Update 2018-12 | Liability For Future Policy Benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 17.0 | 25.0 |
Maximum | Accounting Standards Update 2018-12 | Deferred Policy Acquisition Costs |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 10.0 | 4.0 |
Maximum | Accounting Standards Update 2018-12 | Market Risk Benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  | 3.0 | (1.0) |
Net income (loss) |  |  |  |  | 4.0 | 6.0 |
Maximum | Accounting Standards Update 2018-12 | Measurement Input, Discount Rate |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | 17.0 | 25.0 |
Maximum | Accounting Standards Update 2018-12 | Deferred policy acquisition costs |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | 10.0 | 4.0 |
Maximum | Accounting Standards Update 2018-12 | Market risk benefits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  |  | $ 4.0 | 6.0 |
Real estate property | Minimum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 20 years |  |
Real estate property | Maximum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 45 years |  |
Lease hold improvements and other property and equipment | Minimum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 3 years |  |
Lease hold improvements and other property and equipment | Maximum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  | 10 years |  |
Benefit Consultants Group Inc. |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Impairment charges of intangible assets |  |  | $ 4.4 |  |  |  |
Goodwill impairment |  |  |  | $ 5.6 |  |  |
Value of business acquired |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 70.5 |  |
Amortization in 2023 |  |  |  |  | 5.8 |  |
Amortization in 2024 |  |  |  |  | 5.4 |  |
Amortization in 2025 |  |  |  |  | 5.1 |  |
Amortization in 2026 |  |  |  |  | 4.7 |  |
Amortization in 2027 |  |  |  |  | 4.4 |  |
Value of business acquired | Benefit Consultants Group Inc. |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Impairment of finite lived intangible assets |  |  | 3.6 |  |  |  |
Value of distribution acquired | NTA |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  | 38.9 |  |
Amortization in 2023 |  |  |  |  | 2.9 |  |
Amortization in 2024 |  |  |  |  | 2.9 |  |
Amortization in 2025 |  |  |  |  | 2.9 |  |
Amortization in 2026 |  |  |  |  | 2.9 |  |
Amortization in 2027 |  |  |  |  | 2.9 |  |
Value of distribution acquired | Benefit Consultants Group Inc. |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  | 0.5 |  |
Value of agency relationships | NTA |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Amortization in 2023 |  |  |  |  | 1.6 |  |
Amortization in 2024 |  |  |  |  | 1.4 |  |
Amortization in 2025 |  |  |  |  | 1.2 |  |
Amortization in 2026 |  |  |  |  | 1.0 |  |
Amortization in 2027 |  |  |  |  | 0.9 |  |
Value of agency relationship |  |  |  |  | 8.8 |  |
Value of customer relationships | Benefit Consultants Group Inc. |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  | 53.2 |  |
Amortization in 2023 |  |  |  |  | 4.6 |  |
Amortization in 2024 |  |  |  |  | 4.9 |  |
Amortization in 2025 |  |  |  |  | 5.2 |  |
Amortization in 2026 |  |  |  |  | 5.6 |  |
Amortization in 2027 |  |  |  |  | 6.0 |  |
Impairment charges of intangible assets | 2.5 |  |  |  |  |  |
Impairment of finite lived intangible assets |  |  |  |  | 2.5 |  |
Interest sensitive life contracts |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs, impact of unrealized investment gains (losses) |  |  |  |  | 118.0 | $ (71.9) | $ (90.5)
Trade names |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Impairment of infinite lived intangible assets |  |  |  |  | 0.3 |  |
Trade names | Benefit Consultants Group Inc. |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Impairment charges of intangible assets | $ 0.3 |  |  |  |  |  |
Impairment of infinite lived intangible assets |  |  | $ 0.8 |  | $ 0.3 |  |

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- Definition The number of years over which capitalized acquisition costs are amortized for indexed universal life contracts. Acquisition costs are amortized in proportion to estimated gross profits. + References No definition available. + Details
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- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
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- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
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- Definition The number of years over which capitalized acquisition costs are amortized for individual life contracts. Acquisition costs are amortized in proportion to the anticipated premiums over the terms of the insurance policies. + References No definition available. + Details
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