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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-Based Compensation Expense | Total share-based compensation expense for the three and nine months ended September 30, 2023 and 2022, was as follows:
| Three months ended | Nine months ended
In millions | September 30, 2023 | September 30, 2022 | September 30, 2023 | September 30, 2022
Restricted stock units | $ | 3.0 |  | $ | 2.5 |  | $ | 8.4 |  | $ | 7.4 |
Performance share units | 1.9 |  | 2.3 |  | 5.7 |  | 7.3 |
Stock options | 1.2 |  | 1.1 |  | 3.4 |  | 3.1 |
Total | $ | 6.1 |  | $ | 5.9 |  | $ | 17.5 |  | $ | 17.8 |
Schedule of 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:
| 2023 Annual Grant
Risk-free interest rate | 3.77 | %
Expected dividend yield | 1.73 | %
Expected share price volatility | 36.6 | %
Expected term (years) | 6.5

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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