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STATUTORY INFORMATION (BASED ON NON-GAAP MEASURES) - NARRATIVE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statutory Accounting Practices [Line Items]      
Statutory capital and surplus included investments in upstream affiliates $ 42.6 $ 42.6  
Statutory accounting practices, statutory net income, amount 176.6 105.0 $ 238.0
Statutory accounting practices, net realized capital gain (loss), net of income taxes (20.3) (26.3) (25.9)
Statutory accounting practices, pre-tax amounts for fees and interest paid $ 197.5 $ 190.1 $ 168.4
Percentage of statutory capital and surplus, available for dividend distribution without prior approval from regulatory agency 10.00%    
Amount of dividends paid by insurance subsidiaries $ 196.0    
Capital contribution $ 67.0    
Trended adjusted capital to risk-based capital ratio threshold (less than) 95.00%    
Bermuda Class C Insurer, minimum solvency margin $ 0.5    
Bermuda Class C Insurer, minimum solvency margin, percentage of assets (percent) 1.50%    
Bermuda Class C Insurer, minimum solvency margin, percentage of enhanced capital requirement (percent) 25.00%    
Target capital level percentage 120.00%    
Statutory economic capital and surplus percentage of enhanced capital requirement (percent) 150.00%    
Company Plan for Improving Capital Position | Maximum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 100.00%    
Company Plan for Improving Capital Position | Minimum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 75.00%    
Regulatory Authority Special Examination | Maximum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 75.00%    
Regulatory Authority Special Examination | Minimum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 50.00%    
Regulatory Authority, Any Action Deemed Necessary | Maximum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 50.00%    
Regulatory Authority, Any Action Deemed Necessary | Minimum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 35.00%    
Regulatory Authority Control | Maximum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 35.00%    
Trend Test | Maximum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 150.00%    
Trend Test | Minimum      
Statutory Accounting Practices [Line Items]      
Adjusted capital to risk-based capital ratio 100.00%