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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