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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of Shares Granted
During the six months ended June 30, 2024 and 2023, shares were granted as follows:

Grant PeriodTypePlanShares GrantedGrant Date Fair Value Per ShareVesting Type
2024Key Employees2015 Equity Incentive Plan205,540 $132.10 
(1)
Time Based
2024Executive Officers2015 Equity Incentive Plan31,800 $132.13 
(1)
Time Based
2024Executive Officers2015 Equity Incentive Plan41,400 $98.14 
(2)
Market Condition
(3)
2024Directors2004 Non-Employee Director Option Plan20,000 $129.47 
(1)
Time Based
(4)
2023Key Employees2015 Equity Incentive Plan220,558 $137.15 
(1)
Time Based
2023Executive Officers2015 Equity Incentive Plan62,800 $144.88 
(1)
Time Based
2023Executive Officers2015 Equity Incentive Plan82,200 $108.60 
(2)
Market Condition
(3)
2023Directors2004 Non-Employee Director Option Plan16,000 $148.12 
(1)
Time Based
(5)
(1)Represents the weighted average fair value per share of the closing price of our common stock on the dates the shares were awarded.
(2)Represents the weighted average fair value per share of the Monte Carlo simulation fair value price of our market condition awards on the dates the shares were awarded.
(3)Share-based compensation for restricted stock awards with market conditions is measured based on shares expected to vest using a Monte Carlo simulation to determine fair value.
(4)Includes 6,000 shares that were deferred under the 2021 Non-Employee Directors Deferred Compensation Plan and are issuable on future dates.
(5)Includes 2,000 shares that were deferred under the 2021 Non-Employee Directors Deferred Compensation Plan and are issuable on future dates.
Schedule of Share-based Compensation Costs
We recognized the following share-based compensation costs (in millions):

Three Months EndedSix Months Ended
June 30, 2024June 30, 2023June 30, 2024June 30, 2023
Share-based compensation - expensed(1)
$10.1 $9.9 $20.2 $19.5 
(1) Recorded within General and administrative expense on the Consolidated Income Statements.