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Employee Benefit Arrangements (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
retirement_plan
Dec. 31, 2019
USD ($)
Jan. 01, 2021
retirement_plan
Defined Contribution Plan Disclosure [Line Items]        
Number of 401(k) retirement savings plans | retirement_plan   2   1
Match of every dollar contributed (as a percent)   50.00%    
Employee's eligible compensation (as a percent)   6.00%    
Contribution expense $ 4.4 $ 3.6 $ 3.4  
Service Expense        
Defined Contribution Plan Disclosure [Line Items]        
Contribution expense 2.0 1.7 1.6  
Selling, General and Administrative Expenses        
Defined Contribution Plan Disclosure [Line Items]        
Contribution expense $ 2.4 $ 1.9 $ 1.8