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Stock-based Compensation Plans (Tables) | 3 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Share-based Payment Arrangement, Activity [Table Text Block] | Grants issued during the three months ended December 31, 2024 are as follows:
| Number granted |  | Weighted average grant date fair value per instrument |  | Total grant date fair value (in millions)
Quarter ended December 31, 2024 |  |  |  |  |
MRSUs | 64,044 |  |  | $ | 38.25 |  |  | $ | 2.4 |
PRSUs | 64,044 |  |  | 25.58 |  |  | 1.6 |
Restricted stock units | 87,344 |  |  | 25.58 |  |  | 2.2 |
Phantom Plan instruments | 134,382 |  |  | 25.58 |  |  | 3.4 |
Non-qualified stock options | 207,417 |  |  | 7.90 |  |  | 1.6 |
Employee stock purchase plan instruments | 24,621 |  |  | $ | 3.86 |  |  | 0.1 |
Total - Year-to-date ended December 31, 2024 |  |  |  |  | $ | 11.3 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The assumptions used to determine the grant date fair value are indicated below for awards granted to date during the current fiscal year.
|  | December 3, 2024
Variables used in determining grant date fair value: |  |
Dividend yield |  | 1.10%
Risk-free rate |  | 4.10%
Expected term (in years) |  | 2.80
The assumptions used to determine the grant date fair value are indicated below for awards granted to date during the current fiscal year.
| December 3, 2024
Variables used in determining grant date fair value: |
Dividend yield | 1.64%
Risk-free rate | 4.14%
Expected term (in years) | 6.00

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -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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