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Segment Information
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Segment Information SEGMENT INFORMATION
Our Personal Lines segment writes insurance for personal autos and recreational vehicles (our special lines products). Our Commercial Lines segment writes auto-related liability and physical damage insurance, business-related general liability and property insurance predominately for small businesses, and workers’ compensation insurance primarily for the transportation industry. Our Property segment writes residential property insurance for homeowners, other property owners, and renters. Our service businesses provide insurance-related services, including serving as an agent for homeowners, general liability, and workers’ compensation insurance, among
other products, through programs in our direct Personal Lines and Commercial Lines businesses. As previously disclosed in our 2022 Annual Report to Shareholders, during 2022, our contract to act as a servicing agent for processing Commercial Automobile Insurance Procedures/Plans (CAIP) business expired during the third quarter 2022 and we did not renew the contract. This non-renewal did not materially affect our financial condition, results of operations, or cash flows. All segment revenues are generated from external customers; all intercompany transactions are eliminated in consolidation.
Following are the operating results for the respective periods:
 Three Months Ended September 30,Nine Months Ended September 30,
 2023202220232022
(millions)RevenuesPretax
Profit (Loss)		RevenuesPretax
Profit (Loss)		RevenuesPretax
Profit (Loss)		RevenuesPretax
Profit (Loss)
Personal Lines
Agency$5,414.0 $335.7 $4,441.9 $(41.3)$15,481.4 $427.1 $13,131.7 $507.6 
Direct6,361.8 706.2 5,077.4 40.6 18,259.9 810.6 14,776.9 389.4 
Total Personal Lines1
11,775.8 1,041.9 9,519.3 (0.7)33,741.3 1,237.7 27,908.6 897.0 
Commercial Lines2,486.6 23.0 2,317.9 238.1 7,296.8 147.4 6,749.5 683.5 
Property2
631.8 74.6 561.0 (141.0)1,852.8 (164.9)1,689.6 (289.6)
Other indemnity3
0.1 (3.3)0.7 (2.1)0.9 (6.7)2.0 (9.3)
Total underwriting operations14,894.3 1,136.2 12,398.9 94.3 42,891.8 1,213.5 36,349.7 1,281.6 
Fees and other revenues4
223.7 NA181.4 NA656.6 NA531.9 NA
Service businesses81.4 (10.3)82.7 (0.1)234.9 (29.7)230.5 9.0 
Investments5
361.2 354.0 117.2 111.4 1,434.0 1,415.2 (971.2)(988.6)
Interest expenseNA(69.7)NA(63.1)NA(198.7)NA(180.4)
Property - Goodwill impairment2
NA0 NA0 NA0 NA(224.8)
Consolidated total$15,560.6 $1,410.2 $12,780.2 $142.5 $45,217.3 $2,400.3 $36,140.9 $(103.2)
NA = Not applicable
1 Personal auto insurance accounted for 94% of the total Personal Lines segment net premiums earned during the three and nine months ended September 30, 2023 and 2022; insurance for our special lines products (e.g., motorcycles, RVs, watercraft, and snowmobiles) accounted for the balance of the Personal Lines net premiums earned.
2 For the three and nine months ended September 30, 2023, pretax profit (loss) included $2.9 million and $10.7 million, respectively, of amortization expense associated with intangible assets attributable to our Property segment, and $5.0 million and $24.1 million for the same periods in 2022. For the nine months ended September 30, 2022, the total pretax loss, including goodwill impairment, for the Property segment was $514.4 million. See Note 12 – Goodwill and Intangible Assets for further discussion.
3 Includes other underwriting business and run-off operations.
4 Pretax profit (loss) for fees and other revenues is allocated to operating segments based on revenue.
5 Revenues represent recurring investment income and total net realized gains (losses) on securities; pretax profit (loss) is net of investment expenses.
Our management uses underwriting margin and combined ratio as primary measures of underwriting profitability. The underwriting margin is the pretax underwriting profit (loss) expressed as a percentage of net premiums earned (i.e., revenues from underwriting operations). Pretax underwriting profit (loss) is calculated as net premiums earned plus fees and other revenues, less: (i) losses and loss adjustment expenses; (ii) policy acquisition costs; and (iii) other underwriting expenses. Combined ratio is the complement of the underwriting margin. Following are the underwriting margins and combined ratios for our underwriting operations for the respective periods:
 Three Months Ended September 30,Nine Months Ended September 30,
 2023202220232022
 Under-writing
Margin		Combined
Ratio		Under-writing
Margin		Combined
Ratio		Under-writing
Margin		Combined
Ratio		Under-writing
Margin		Combined
Ratio
Personal Lines
Agency6.2 %93.8 (0.9)%100.9 2.8 %97.2 3.9 %96.1 
Direct11.1 88.9 0.8 99.2 4.4 95.6 2.6 97.4 
Total Personal Lines8.8 91.2 0 100.0 3.7 96.3 3.2 96.8 
Commercial Lines0.9 99.1 10.3 89.7 2.0 98.0 10.1 89.9 
Property1
11.8 88.2 (25.1)125.1 (8.9)108.9 (17.1)117.1 
Total underwriting operations7.6 92.4 0.8 99.2 2.8 97.2 3.5 96.5 
1 Included in the three and nine months ended September 30, 2023, is 0.5 points and 0.6 points, respectively, of amortization expense associated with intangible assets and 0.9 points and 1.4 points, respectively, for the three and nine months ended September 30, 2022.