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Share-Based Compensation (Tables) | 6 Months Ended
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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 Period |  | Type |  | Plan |  | Shares Granted |  | Grant Date Fair Value Per Share |  | Vesting Type |  |  |  |
2024 |  | Key Employees |  | 2015 Equity Incentive Plan |  | 205,540 |  |  | $ | 132.10 |  | (1) | Time Based |  |
2024 |  | Executive Officers |  | 2015 Equity Incentive Plan |  | 31,800 |  |  | $ | 132.13 |  | (1) | Time Based |  |
2024 |  | Executive Officers |  | 2015 Equity Incentive Plan |  | 41,400 |  |  | $ | 98.14 |  | (2) | Market Condition | (3) |  |  |
2024 |  | Directors |  | 2004 Non-Employee Director Option Plan |  | 20,000 |  |  | $ | 129.47 |  | (1) | Time Based | (4) |  |  |
2023 |  | Key Employees |  | 2015 Equity Incentive Plan |  | 220,558 |  |  | $ | 137.15 |  | (1) | Time Based |  |
2023 |  | Executive Officers |  | 2015 Equity Incentive Plan |  | 62,800 |  |  | $ | 144.88 |  | (1) | Time Based |  |
2023 |  | Executive Officers |  | 2015 Equity Incentive Plan |  | 82,200 |  |  | $ | 108.60 |  | (2) | Market Condition | (3) |  |  |
2023 |  | Directors |  | 2004 Non-Employee Director Option Plan |  | 16,000 |  |  | $ | 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 Ended |  | Six Months Ended
|  | June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 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.

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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