v3.26.3
Segment Information - Segment Adjusted EBITDA Disclosure (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Fees and other income $ 579.7 $ 484.4 $ 1,634.1 $ 1,351.0
Net investment income 147.2 133.5 449.2 387.0
Total revenues 3,529.5 3,231.5 10,403.8 9,463.9
Policyholder benefits 782.4 709.6 2,299.8 2,210.8
Operating | Global Lifestyle        
Segment Reporting [Line Items]        
Net investment income 100.1 90.9 306.3 262.6
Total revenues 2,761.2 2,497.1 8,091.3 7,326.2
Policyholder benefits 548.5 486.0 1,564.7 1,389.9
Selling and underwriting expense 1,310.2 1,231.2 3,905.1 3,727.2
Cost of sales 312.9 249.0 880.5 665.2
General expenses 352.7 324.1 1,023.0 937.9
Segment Adjusted EBITDA 236.9 206.8 718.0 606.0
Operating | Global Housing        
Segment Reporting [Line Items]        
Net investment income 36.3 36.0 112.6 104.1
Total revenues 781.2 738.9 2,334.4 2,161.5
Policyholder benefits 232.4 221.9 731.7 813.6
Selling and underwriting expense 61.5 54.9 181.8 146.8
General expenses 219.0 205.8 641.1 618.0
Segment Adjusted EBITDA 268.3 256.3 779.8 583.1
Operating | Connected Living | Global Lifestyle        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 1,583.5 1,357.2 4,618.2 3,917.0
Operating | Global Automotive | Global Lifestyle        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 1,077.6 1,049.0 3,166.8 3,146.6
Operating | Homeowners | Global Housing        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 600.0 553.9 1,780.5 1,629.6
Operating | Renters and Other | Global Housing        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 144.9 149.0 441.3 427.8
Corporate        
Segment Reporting [Line Items]        
Fees and other income 0.0 0.0 0.0 1.7
Net investment income 10.1 5.7 28.2 17.1
Total revenues 10.1 5.7 28.2 18.8
Policyholder benefits 0.0 0.0 0.0 0.0
General expenses 50.9 37.3 140.9 108.2
Segment Adjusted EBITDA $ (40.8) $ (31.6) $ (112.7) $ (89.4)