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Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets [Abstract]    
Fixed maturity securities, available-for-sale (amortized cost of $17,386,303 in 2025 and $16,457,723 in 2024) $ 17,259,981 $ 15,745,539
Equity securities (cost of $4,024,656 in 2025 and $3,887,820 in 2024) 12,787,616 11,784,521
Short-term investments, available-for-sale (estimated fair value approximates cost) 2,115,757 2,524,910
Total Investments 32,163,354 30,054,970
Cash and cash equivalents 4,049,174 3,692,667
Restricted cash and cash equivalents 567,729 499,581
Receivables 4,268,847 3,626,799
Reinsurance recoverables 12,989,511 11,604,844
Deferred policy acquisition costs 984,401 875,710
Prepaid reinsurance premiums 3,704,576 2,947,213
Goodwill 2,820,761 2,735,867
Intangible assets 1,566,955 1,459,620
Other assets 4,276,254 4,400,711
Total Assets 67,391,562 61,897,982
Liabilities and Equity [Abstract]    
Unpaid losses and loss adjustment expenses 29,137,969 26,633,094
Life and annuity benefits 598,973 583,273
Unearned premiums 8,233,797 7,063,956
Payables to insurance and reinsurance companies 1,799,672 1,434,901
Senior long-term debt and other debt (estimated fair value of $3,872,000 in 2025 and $3,791,000 in 2024) 4,284,763 4,330,341
Other liabilities 4,741,022 4,383,444
Total Liabilities 48,796,196 44,429,009
Redeemable noncontrolling interests 536,045 540,034
Commitments and contingencies
Shareholders' equity:    
Preferred Stock 0 591,891
Common stock 3,666,946 3,560,633
Retained earnings 14,512,739 13,380,456
Accumulated other comprehensive loss (138,973) (617,082)
Total Shareholders' Equity 18,040,712 16,915,898
Noncontrolling interests 18,609 13,041
Total Equity 18,059,321 16,928,939
Total Liabilities and Equity $ 67,391,562 $ 61,897,982