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Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Investments:    
Fixed income securities (at fair value) (amortized cost: $12,210.9 and $12,175.9) $ 12,357.2 $ 12,091.5
Equity securities (at fair value) (cost: $1,422.8 and $1,410.7) 2,567.8 2,540.7
Short-term investments (at fair value which approximates cost) 1,215.4 1,403.7
Other investments 28.9 42.8
Total investments 16,169.5 16,079.0
Cash 178.1 201.9
Accrued investment income 132.0 127.9
Accounts and notes receivable 2,974.0 2,471.6
Federal income tax recoverable: Current 4.3 13.8
Reinsurance balances and funds held 388.8 423.1
Reinsurance recoverable: Paid loss and loss adjustment expenses 191.6 185.3
Reinsurance recoverable for loss and loss adjustment expense reserves 6,236.0 5,807.1
Unearned premium and policy reserves 1,305.6 921.6
Deferred policy acquisition costs 588.5 531.3
Other assets 1,086.8 1,080.2
Total assets 29,255.7 27,843.1
Liabilities and Common Shareholders' Equity Liabilities:    
Loss and loss adjustment expense reserves 14,356.4 13,727.7
Unearned premiums 4,018.5 3,505.4
Other policyholders' benefits and funds held 178.8 174.0
Total policy liabilities 18,553.8 17,407.2
Commissions, expenses, fees, and taxes 499.6 547.5
Reinsurance balances and funds held 1,637.9 1,409.8
Deferred Income Tax Liabilities, Net 191.0 129.1
Debt 1,589.3 1,588.7
Other liabilities 580.2 1,141.6
Total liabilities 23,052.1 22,224.1
Shareholders' Equity:    
Preferred Stock 0.0 0.0
Common stock 248.4 248.8
Additional paid-in capital 32.1 0.0
Retained earnings 5,853.8 5,519.7
Accumulated other comprehensive income (loss) 91.7 (102.4)
Unallocated 401(k) plan shares (at cost) (40.6) (47.1)
Treasury Stock (at cost) 0.0 0.0
Total equity 6,185.6 5,618.9
Equity, Attributable to Noncontrolling Interest 17.9 0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 6,203.5 5,618.9
Total liabilities and equity $ 29,255.7 $ 27,843.1