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Revenue from Contracts with Customers - Summary of Disaggregation of Revenues from Contracts (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers $ 839,852 $ 774,129 $ 2,438,028 $ 2,301,033
Term Life Insurance Segment [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 463,301 450,306 1,362,975 1,317,661
Term Life Insurance Segment [Member] | Total Segment Revenues from Contracts with Customers [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 12,189 14,206 37,155 39,479
Term Life Insurance Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 12,189 14,206 37,155 39,479
Term Life Insurance Segment [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 451,112 436,100 1,325,820 1,278,182
Investment and Savings Product Segment [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 318,788 266,073 907,898 770,695
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 305,183 252,318 868,486 729,753
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 3,445 3,646 10,013 10,128
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Sales-based Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 118,637 96,269 345,841 286,192
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Asset-based Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 158,681 128,296 439,624 362,406
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Account-based Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 24,420 24,107 73,008 71,027
Investment and Savings Product Segment [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 13,605 13,755 39,412 40,942
Corporate and Other Distributed Products Segment Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 57,763 57,750 167,155 212,677
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 11,245 10,725 33,686 31,191
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 1,098 1,251 3,093 2,719
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 10,147 9,474 30,593 28,472
Corporate and Other Distributed Products Segment Revenues [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers $ 46,518 $ 47,025 $ 133,469 $ 181,486