v3.26.1
Segment Information - Segment Adjusted EBITDA Disclosure (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Fees and other income $ 554.6 $ 463.7 $ 1,054.4 $ 866.6
Net investment income 142.4 128.7 302.0 253.5
Total revenues 3,454.2 3,158.4 6,874.3 6,232.4
Policyholder benefits 748.3 721.5 1,517.4 1,501.2
Operating | Global Lifestyle        
Segment Reporting [Line Items]        
Net investment income 97.3 87.7 206.2 171.7
Total revenues 2,670.2 2,438.5 5,330.1 4,829.1
Policyholder benefits 512.5 461.5 1,016.2 903.9
Selling and underwriting expense 1,267.7 1,230.2 2,594.9 2,496.0
Cost of sales 302.6 231.4 567.6 416.2
General expenses 343.0 314.0 670.3 613.8
Segment Adjusted EBITDA 244.4 201.4 481.1 399.2
Operating | Global Housing        
Segment Reporting [Line Items]        
Net investment income 35.6 34.4 76.3 68.1
Total revenues 783.4 732.1 1,553.2 1,422.6
Policyholder benefits 235.4 258.7 499.3 591.7
Selling and underwriting expense 60.4 52.4 120.3 91.9
General expenses 212.8 206.6 422.1 412.2
Segment Adjusted EBITDA 274.8 214.4 511.5 326.8
Operating | Connected Living | Global Lifestyle        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 1,554.5 1,326.4 3,034.7 2,559.8
Operating | Global Automotive | Global Lifestyle        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 1,018.4 1,024.4 2,089.2 2,097.6
Operating | Homeowners | Global Housing        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 600.4 552.8 1,180.5 1,075.7
Operating | Renters and Other | Global Housing        
Segment Reporting [Line Items]        
Net earned premiums, fees, and other income 147.4 144.9 296.4 278.8
Corporate        
Segment Reporting [Line Items]        
Fees and other income 0.0 1.3 0.0 1.7
Net investment income 8.8 5.6 18.1 11.4
Total revenues 8.8 6.9 18.1 13.1
Policyholder benefits 0.0 0.0 0.0 0.0
General expenses 48.8 36.7 90.0 70.9
Segment Adjusted EBITDA $ (40.0) $ (29.8) $ (71.9) $ (57.8)