Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investments:
Fixed income securities (at fair value) (amortized cost: $12,263.0 and $12,336.3)	$ 12,139.9	$ 11,746.7
Short-term investments (at fair value which approximates cost)	1,032.6	860.8
Equity securities (at fair value) (cost: $1,511.9 and $1,948.1)	2,660.8	3,220.9
Other investments	34.3	31.2
Total investments	15,867.7	15,859.9
Cash	202.8	81.0
Accrued investment income	117.0	106.7
Accounts and notes receivable	2,201.4	1,927.5
Federal income tax recoverable: Current	21.8	15.7
Reinsurance balances and funds held	544.7	323.0
Reinsurance recoverable: Paid losses	175.4	119.4
Reinsurance recoverable for loss and loss adjustment expense reserves	4,977.7	4,699.5
Unearned premium and policy reserves	798.2	768.9
Deferred policy acquisition costs	417.8	382.5
Disposal Group, Including Discontinued Operation, Assets	194.8	0.0
Other assets	981.5	874.8
Total assets	26,501.4	25,159.4
Liabilities:
Loss and loss adjustment expense reserves	12,538.2	12,221.5
Unearned premiums	3,042.7	2,787.8
Other policyholders' benefits and funds held	150.3	182.2
Total policy liabilities	15,731.4	15,191.6
Commissions, expenses, fees, and taxes	533.8	514.8
Reinsurance balances and funds held	1,380.9	1,079.4
Deferred Tax Liabilities, Net	105.6	42.7
Debt	1,591.2	1,597.0
Disposal Group, Including Discontinued Operation, Liabilities	56.8	0.0
Other liabilities	690.6	560.5
Total liabilities	20,090.7	18,986.2
Preferred Stock	0.0	0.0
Common Shareholders' Equity:
Common stock	278.3	296.9
Additional paid-in capital	678.7	1,141.8
Retained earnings	5,644.3	5,321.8
Accumulated other comprehensive loss	(132.4)	(517.8)
Unallocated 401(k) plan shares (at cost)	(58.2)	(69.5)
Total common shareholders' equity	6,410.7	6,173.2
Total liabilities, preferred stock and common shareholders' equity	$ 26,501.4	$ 25,159.4