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Basis of Presentation and Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) plan segment $ / shares shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Number of reportable segments (in segments) | segment | 4 |  |  |  |
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 and group benefits | 6 years |  |  |  |
Purchase price | $ 156.9 |  |  |  |
Amortization in 2024 | 14.5 |  |  |  |
Amortization in 2025 | 14.3 |  |  |  |
Amortization in 2026 | 14.2 |  |  |  |
Amortization in 2027 | 14.1 |  |  |  |
Amortization in 2028 | 14.1 |  |  |  |
Goodwill impairment | $ 0.0 | $ 2.0 |  | $ 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 | 15.00% | 25.00% |  |  |
Repayment of FHLB funding agreements | $ 189.5 | $ 149.0 | [1] | 362.0 | [1]
FHLB advances | $ 904.5 | 792.5 |  |  |
Reverse repurchase agreement, cash to value percentage | 95.00% |  |  |  |
Securities sold under agreements to repurchase | $ 0.0 | 70.2 |  |  |
Share-based compensation expense | $ 7.5 | 6.9 |  | 6.6 |
Weighted average fair value of nonvested options outstanding (in usd per share) | $ / shares | $ 8.11 |  |  |  |
Unrecognized share-based compensation expense, nonvested options | $ 2.6 |  |  |  |
Antidilutive securities exclude from EPS computation (in shares) | shares | 1,243,169 |  |  |  |
Minimum exercise price (in usd per share) | $ / shares | $ 32.13 |  |  |  |
Maximum exercise price (in usd per share) | $ / shares | $ 42.95 |  |  |  |
Qualified Plan |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Number of retirement plans | plan | 2 |  |  |  |
Nonqualified Plan |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Number of retirement plans | plan | 2 |  |  |  |
401(k) plan assets | Qualified Plan | Pension Plan |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Employer matching contribution as percent of employees' gross pay | 3.00% |  |  |  |
Percentage of employer match | 5.00% |  |  |  |
Vesting period for Company contributions | 5 years |  |  |  |
Fair Value |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Securities sold under agreements to repurchase | $ 0.0 | 73.9 |  |  |
Employee stock option |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Share-based compensation expense | 1.4 | $ 1.2 |  | $ 1.2 |
Restricted stock units |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Unrecognized share-based compensation expense, equity instruments other than options | 8.9 |  |  |  |
HMLIC and NTA |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Proceeds from FHLB funding agreements | 301.5 |  |  |  |
Repayment of FHLB funding agreements | $ 189.5 |  |  |  |
Minimum |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
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 [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 |  |  |  |
Value of business acquired |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Purchase price | $ 64.8 |  |  |  |
Amortization in 2024 | 5.4 |  |  |  |
Amortization in 2025 | 5.1 |  |  |  |
Amortization in 2026 | 4.7 |  |  |  |
Amortization in 2027 | 4.4 |  |  |  |
Amortization in 2028 | 4.1 |  |  |  |
Value of distribution acquired | NTA |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Purchase price | 36.0 |  |  |  |
Amortization in 2024 | 2.9 |  |  |  |
Amortization in 2025 | 2.9 |  |  |  |
Amortization in 2026 | 2.9 |  |  |  |
Amortization in 2027 | 2.9 |  |  |  |
Amortization in 2028 | 2.9 |  |  |  |
Value of agency relationships | NTA |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Amortization in 2024 | 1.4 |  |  |  |
Amortization in 2025 | 1.2 |  |  |  |
Amortization in 2026 | 1.0 |  |  |  |
Amortization in 2027 | 0.9 |  |  |  |
Amortization in 2028 | 0.8 |  |  |  |
Value of agency relationship | 7.2 |  |  |  |
Value of customer relationships | Benefit Consultants Group Inc. |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Purchase price | 48.4 |  |  |  |
Amortization in 2024 | 4.8 |  |  |  |
Amortization in 2025 | 5.1 |  |  |  |
Amortization in 2026 | 5.5 |  |  |  |
Amortization in 2027 | 5.9 |  |  |  |
Amortization in 2028 | $ 6.3 |  |  |  |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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