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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred policy acquisition costs $ 424,864 $ 368,624 $ 326,915
Reserve for loss and loss expenses 5,336,911 5,144,821 4,580,903
Unearned premiums 2,330,656 1,992,781 1,803,207
Net premiums earned 3,827,606 3,373,380 3,017,253
Net investment income [1] 385,098 173,347 344,188
Loss and loss expense incurred 2,484,285 2,111,778 1,813,984
Amortization of deferred policy acquisition costs 796,182 705,822 626,469
Other operating expenses 414,340 [2] 388,978 [3] 358,208 [4]
Net premiums written 4,134,532 3,573,590 3,189,713
Other insurance expenses 433,742 400,313 375,931
Other income 19,402 11,335 17,723
Standard Commercial Lines [Member]      
Deferred policy acquisition costs 350,198 311,535 279,850
Reserve for loss and loss expenses 4,494,965 4,275,002 3,832,151
Unearned premiums 1,722,706 1,511,447 1,346,809
Net premiums earned 3,071,784 2,739,819 2,443,885
Net investment income 0 0 0
Loss and loss expense incurred 1,919,204 1,683,988 1,426,768
Amortization of deferred policy acquisition costs 674,374 605,845 539,606
Other operating expenses 320,900 306,290 278,915
Net premiums written 3,281,319 2,901,984 2,593,018
E&S Lines [Member]      
Deferred policy acquisition costs 49,907 39,272 34,154
Reserve for loss and loss expenses 563,794 529,517 478,686
Unearned premiums 208,793 158,666 139,122
Net premiums earned 390,609 334,156 279,809
Net investment income 0 0 0
Loss and loss expense incurred 211,896 196,677 175,100
Amortization of deferred policy acquisition costs 85,807 72,848 60,945
Other operating expenses 38,150 34,332 27,734
Net premiums written 438,628 352,547 304,430
Miscellaneous Income [Member]      
Other income 19,402 11,335 17,723
Standard Personal Lines      
Deferred policy acquisition costs 24,759 17,817 12,911
Reserve for loss and loss expenses 278,152 340,302 270,066
Unearned premiums 399,157 322,668 317,276
Net premiums earned 365,213 299,405 293,559
Net investment income 0 0 0
Loss and loss expense incurred 353,185 231,113 212,116
Amortization of deferred policy acquisition costs 36,001 27,129 25,918
Other operating expenses 55,290 48,356 51,559
Net premiums written 414,585 319,059 292,265
Investments SIGI      
Deferred policy acquisition costs 0 0 0
Reserve for loss and loss expenses 0 0 0
Unearned premiums 0 0 0
Net premiums earned 0 0 0
Net investment income [1] 385,098 173,347 344,188
Loss and loss expense incurred 0 0 0
Amortization of deferred policy acquisition costs 0 0 0
Other operating expenses 0 0 0
Net premiums written $ 0 $ 0 $ 0
[1] Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
[2] “Other operating expenses” of $414,340 reconciles to the Consolidated Statements of Income
[3] “Other operating expenses” of $388,978 reconciles to the Consolidated Statements of Income
[4] “Other operating expenses” of $358,208 reconciles to the Consolidated Statements of Income