v3.26.3
Reserves - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development $ (97.4) $ (126.2)
Other Product and Services    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (5.8) 1.0
Global Lifestyle    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (42.1) (40.6)
Global Lifestyle | Global Automotive    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (22.8)  
Global Lifestyle | Connected Living    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (19.3)  
Global Lifestyle | Mobile Contracts    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (8.6)  
Global Lifestyle | Extended Service Contracts    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (7.6)  
Global Lifestyle | Credit and Other Insurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (3.1)  
Global Housing    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (49.5) (86.6)
Global Housing | Non-catastrophe Losses    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development (60.7) $ 11.2
Global Housing | Lender-placed Insurance | Non-catastrophe Losses    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Unfavorable (favorable) prior year development $ (43.1)