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Share-Based Payments (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Compensation Plan Approval
The following table provides information regarding the approval of these plans:

PlanApprovals
Stock Plan
Approved effective May 1, 2024 by stockholders on the effective date.
Cash PlanApproved effective April 1, 2005 by stockholders on April 27, 2005.
Most recently amended and restated plan was approved effective May 1, 2014 by stockholders on April 23, 2014.
ESPPApproved effective July 1, 2009 by stockholders on April 29, 2009.
Most recently amended and restated plan was approved effective July 1, 2021 by stockholders on April 28, 2021.
Agent Plan
Approved by stockholders on April 26, 2006.
Most recently amended and restated plan was approved effective November 1, 2020 by the Salary and Employee Benefits Committee (now known as the Compensation and Human Capital Committee) of the Parent's Board on October 26, 2020.
Schedule of Types of Share-Based Payments Issued
The types of awards that can be issued under each of these plans are as follows:

Plan
Types of Share-Based Payments
Stock Plan
Qualified and nonqualified stock options, stock appreciation rights ("SARs"), restricted stock, RSU's, stock grants, and other awards valued in whole or in part by reference to the Parent's common stock. The maximum exercise period for an option grant under this plan is 10 years from the date of the grant. Dividend equivalent units ("DEUs") are earned during the vesting period on RSU grants. The DEUs are reinvested in the Parent's common stock at fair value on each dividend payment date. The requisite service period for grants to employees under this plan is the lesser of: (i) the stated vested date, which is typically three years from issuance; or (ii) the date the employee becomes eligible to retire.
Cash Plan
CIUs. The initial dollar value of each CIU will be adjusted to reflect the percentage increase or decrease in the total shareholder return on the Parent's common stock over a specified performance period. In addition, for certain grants, the number of CIUs granted will be increased or decreased to reflect our performance on specified performance indicators compared to targeted peer companies. The requisite service period for grants under this plan is the lesser of: (i) the stated vested date, which is typically three years from issuance; or (ii) the date the employee becomes eligible to retire.
ESPPEnables employees to purchase shares of the Parent’s common stock. The purchase price is the lower of: (i) 85% of the closing market price at the time the option is granted; or (ii) 85% of the closing price at the time the option is exercised. Shares are generally issued on June 30 and December 31 of each year.
Agent PlanQuarterly offerings to purchase the Parent's common stock at a 10% discount with a one-year restricted period during which the shares purchased cannot be sold or transferred. Only our independent retail insurance agencies and wholesale general agencies, and certain eligible persons associated with the agencies, are eligible to participate in this plan.
Schedule of Shares Authorized and Available for Issuance
Shares authorized and available for issuance as of December 31, 2024 were as follows:

AuthorizedAvailable for IssuanceAwards Outstanding
Stock Plan2,000,000 1,969,236 28,216 
ESPP5,500,000 975,358 — 
Agent Plan3,000,000 1,466,600 — 
Schedule of Share-Based Compensation Retired Plans
The following plans are closed for the issuance of new awards as of December 31, 2024, although awards outstanding continue in effect according to the terms of the applicable award agreements:

Plan
Types of Share-Based Payments Available Under Plan
Reserve Shares
Awards Outstanding
2014 Omnibus Stock Plan ("2014 Stock Plan")1
Qualified and nonqualified stock options, SARs, restricted stock, RSUs, stock grants, and other awards valued in whole or in part by reference to the Parent's common stock. The maximum exercise period for an option grant under this plan is 10 years from the date of the grant. DEUs are earned during the vesting period on RSU grants. The DEUs are reinvested in the Parent's common stock at fair value on each dividend payment date. The requisite service period for grants to employees under this plan is the lesser of: (i) the stated vested date, which is typically three years from issuance; or (ii) the date the employee becomes eligible to retire.
2,667,681 545,586 
2005 Omnibus Stock Plan ("2005 Stock Plan")2
Qualified and nonqualified stock options, SARs, restricted stock, RSUs, phantom stock, stock bonuses, and other awards in such amounts and with such terms and conditions as it determined, subject to the provisions of the 2005 Stock Plan. The maximum exercise period for an option grant under this plan is 10 years from the date of the grant. DEUs are earned during the vesting period on RSU grants. The DEUs are reinvested in the Parent's common stock at fair value on each dividend payment date.1,942,226 16,826 
Parent's Stock Compensation Plan for Non-employee Directors2
Directors could elect to receive a portion of their annual compensation in shares of the Parent's common stock.28,707 28,707 
1Awards outstanding represent RSUs granted to our employees and shares deferred by our non-employee directors prior to May 1, 2024.
2Awards outstanding represent shares deferred by our non-employee directors.
Schedule of Restricted Stock Units Transactions under Share-Based Payment Plans
A summary of the RSU transactions under our share-based payment plans is as follows:

Number
of Shares		Weighted Average
Grant Date Fair Value
Unvested RSU awards at December 31, 2023551,221 $79.23 
Granted 2024227,350 96.61 
Vested 2024(211,214)67.98 
Forfeited 2024(9,913)91.00 
Unvested RSU awards at December 31, 2024557,444 $90.40 
Schedule of Share-Based Compensation ESPP and ASPP Shares Granted
A summary of ESPP and Agent Plan share issuances is as follows:

202420232022
ESPP Issuances74,430 67,075 67,986 
Agent Plan Issuances42,112 42,786 56,736 
Schedule of Weighted Average Assumptions for Employee Stock Purchase Plan
The weighted average assumptions used to value the ESPP option awards were as follows:

 ESPP
 202420232022
Risk-free interest rate5.31 %5.14 1.42 
Expected term6 months6 months6 months
Dividend yield1.4 %1.3 1.3 
Expected volatility19 %26 21 
Schedule of Weighted-Average Fair Value of Options and Stock Per Share
The weighted-average fair value per share of options and stock, including RSUs granted under the Parent's stock plans, during 2024, 2023, and 2022 was as follows:

 202420232022
RSUs$96.61 99.55 76.09 
ESPP:  
Six month option5.56 6.67 4.43 
Discount of grant date market value14.58 13.91 12.61 
Total ESPP20.14 20.58 17.04 
Agent Plan:   
Discount of grant date market value9.77 9.99 8.28 
Schedule of Compensation Cost for Share-based Payment Arrangements
The following table provides share-based compensation expense in 2024, 2023, and 2022:

($ in millions)202420232022
Share-based compensation expense, pre-tax$26.5 23.0 23.6 
Income tax benefit, including the benefit related to stock grants that vested during the year(6.7)(6.4)(5.6)
Share-based compensation expense, after-tax$19.8 16.6 18.0