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Employee Stock and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation Expense | The following share-based compensation expense amounts were recognized in our Consolidated Statement of Income for the periods presented.
Share-Based Compensation Expense
Year Ended December 31 | 2024 | 2023 | 2022
Millions |  |  |
Performance Shares | $1.8 |  | $3.1 |  | $0.7 |
Restricted Stock Units | 0.9 |  | 0.8 |  | 0.9 |
Total Share-Based Compensation Expense | $2.7 |  | $3.9 |  | $1.6 |
Income Tax Benefit | $0.8 |  | $1.1 |  | $0.5 |
Performance Shares | Performance Shares. The following table presents information regarding our non-vested performance shares.
| 2024 | 2023 | 2022
| Number of Shares | Weighted- Average Grant Date Fair Value | Number of Shares | Weighted- Average Grant Date Fair Value | Number of Shares | Weighted- Average Grant Date Fair Value
Non-vested as of January 1 | 111,498 | $66.71 | 60,489 | $69.62 | 80,661 | $75.80
Granted (a) | 88,927 | $64.33 | 54,039 | $63.50 | 37,731 | $67.22
Awarded | (46,725) | $70.14 | — | — | — | —
Unearned Grant Award | — | — | — | — | (50,524) | $77.49
Forfeited | (12,099) | $64.81 | (3,030) | $67.60 | (7,379) | $71.00
Non-vested as of December 31 | 141,601 | $64.24 | 111,498 | $66.71 | 60,489 | $69.62
(a) Shares granted include accrued dividends.
Restricted Stock Units | Restricted Stock Units. The following table presents information regarding our available restricted stock units.
| 2024 | 2023 | 2022
| Number of Shares | Weighted- Average Grant Date Fair Value | Number of Shares | Weighted- Average Grant Date Fair Value | Number of Shares | Weighted- Average Grant Date Fair Value
Available as of January 1 | 43,744 | $62.38 | 33,564 | $68.80 | 28,141 | $73.16
Granted (a) | 27,956 | $59.62 | 21,200 | $61.16 | 15,477 | $63.70
Awarded | (13,381) | $63.80 | (9,631) | $81.91 | (7,396) | $75.55
Forfeited | (4,208) | $60.21 | (1,389) | $63.46 | (2,658) | $66.44
Available as of December 31 | 54,111 | $60.77 | 43,744 | $62.38 | 33,564 | $68.80
(a) Shares granted include accrued dividends.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -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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