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Share Plans (Tables) | 3 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Share-based Compensation Expense | Total share-based compensation expense for the three months ended March 31, 2025 and 2024 was as follows:
|  |  | Three months ended
In millions |  |  |  | March 31, 2025 | March 31, 2024
Restricted stock units |  |  |  | $ | 3.3 |  | $ | 3.8 |
Stock options |  |  |  | 2.6 |  | 1.4 |
Performance share units |  |  |  | 6.7 |  | 2.7 |
Total share-based compensation expense |  |  |  | $ | 12.6 |  | $ | 7.9 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | We estimated the fair value of each stock option award issued in the annual share-based compensation grant using a Black-Scholes option pricing model, modified for dividends and using the following assumptions:
| 2025 Annual Grant
Risk-free interest rate | 4.12 | %
Expected dividend yield | 0.98 | %
Expected share price volatility | 31.10 | %
Expected term (years) | 6.9

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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 significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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