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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Supplementary Insurance Information By Segment [Line Items]      
Deferred acquisition costs $ 703.0 $ 662.8 $ 620.8
Unearned premiums 3,440.4 3,283.3 3,102.5
Other policy claims and benefits payable 15.4 14.1 12.8
Premium revenue 6,161.1 5,912.6 5,663.1
Net investment income [1] 454.4 372.6 332.1
Benefits, claims, losses and settlement expenses 3,729.3 3,757.4 4,134.6
Amortization of deferred acquisition costs 1,285.2 1,221.7 1,176.0
Other operating expenses [2] 736.1 720.5 641.8
Premiums written 6,322.1 6,083.6 5,810.2
Operating Segments [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Future policy benefits, losses, claims and loss expenses 7,739.8 7,447.1 7,295.3
Interest On Debt [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Other operating expenses [2] 43.2 34.1 34.1
Eliminations [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Other operating expenses [2]   (3.6) (8.1)
Core Commercial [Member] | Operating Segments [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Deferred acquisition costs 234.6 230.8 223.0
Future policy benefits, losses, claims and loss expenses 3,853.1 3,606.3 3,461.5
Unearned premiums 1,187.9 1,121.4 1,066.8
Other policy claims and benefits payable 8.3 7.4 6.9
Premium revenue 2,211.0 2,148.8 2,060.3
Net investment income [1] 202.5 170.4 151.8
Benefits, claims, losses and settlement expenses 1,411.9 1,302.1 1,354.9
Amortization of deferred acquisition costs 481.2 462.6 443.8
Other operating expenses [2] 274.7 277.9 250.9
Premiums written 2,273.7 2,195.5 2,107.0
Specialty [Member] | Operating Segments [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Deferred acquisition costs 227.0 209.2 193.6
Future policy benefits, losses, claims and loss expenses 1,725.7 1,669.1 1,619.6
Unearned premiums 850.8 800.4 755.1
Other policy claims and benefits payable 7.1 6.7 5.9
Premium revenue 1,398.3 1,322.0 1,274.2
Net investment income [1] 102.6 84.5 71.1
Benefits, claims, losses and settlement expenses 676.9 646.7 645.5
Amortization of deferred acquisition costs 367.2 347.4 329.5
Other operating expenses [2] 165.5 160.6 133.2
Premiums written 1,441.5 1,373.9 1,293.3
Personal Lines [Member] | Operating Segments [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Deferred acquisition costs 241.4 222.8 204.2
Future policy benefits, losses, claims and loss expenses 2,131.4 2,108.8 2,148.8
Unearned premiums 1,401.7 1,361.5 1,280.6
Premium revenue 2,551.8 2,441.8 2,328.6
Net investment income [1] 128.5 106.7 96.8
Benefits, claims, losses and settlement expenses 1,639.8 1,807.2 2,131.9
Amortization of deferred acquisition costs 436.8 411.7 402.7
Other operating expenses [2] 238.6 234.0 211.6
Premiums written 2,606.9 2,514.2 2,409.9
Other [Member] | Operating Segments [Member]      
Supplementary Insurance Information By Segment [Line Items]      
Future policy benefits, losses, claims and loss expenses 29.6 62.9 65.4
Net investment income [1] 20.8 11.0 12.4
Benefits, claims, losses and settlement expenses 0.7 1.4 2.3
Other operating expenses [2] $ 14.1 $ 17.5 $ 20.1
[1] The Company manages investment assets for its Core Commercial, Specialty, Personal Lines and Other segments on a combined basis, based on the requirements of its combined insurance companies. Net investment income is allocated to these segments based on actuarial information related to the underlying businesses.
[2] For other operating expenses that are not directly attributable to a single segment, expenses are allocated using a consistent and reasonable approach, generally based on net premiums earned.