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Dividend Restrictions (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Nov. 30, 2023
May 31, 2023
Jan. 01, 2023
NEW HAMPSHIRE [Member]            
Statutory Accounting Practices [Line Items]            
Percentage of policyholder's surplus distributes as dividends and other distributions 10.00%          
Dividends declared $ 100,000,000.0 $ 255,000,000.0 $ 245,000,000.0      
Dividends paid to parent $ 100,000,000.0 255,000,000.0 245,000,000.0      
NEW HAMPSHIRE [Member] | Scenario Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Statutory amount available for dividend payments         $ 268,300,000  
NEW HAMPSHIRE [Member] | Maximum [Member] | Scenario Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Maximum dividends payable without prior approval of state regulators         $ 100,000,000.0  
NEW HAMPSHIRE [Member] | Maximum [Member] | Subsequent Event [Member]            
Statutory Accounting Practices [Line Items]            
Maximum dividends payable without prior approval of state regulators           $ 168,300,000
MICHIGAN [Member]            
Statutory Accounting Practices [Line Items]            
Percentage of policyholder's surplus distributes as dividends and other distributions 10.00%          
Dividends declared $ 72,000,000.0 90,000,000.0        
Dividends paid to parent $ 72,000,000.0 $ 90,000,000.0        
Extraordinary dividends declared     $ 82,000,000.0      
MICHIGAN [Member] | Scenario Forecast [Member]            
Statutory Accounting Practices [Line Items]            
Statutory amount available for dividend payments       $ 68,900,000