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Capital Stock (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Weighted Average Number of Shares | Shares Used to Calculate Earnings per Share
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Weighted-average shares: |  |  |  |  |  |  |
Basic(a) | 41.9 |  |  | 44.2 |  |  | 42.4 |  |  | 44.5 |
Effect of dilutive stock awards and options | 0.2 |  |  | 0.6 |  |  | 0.3 |  |  | 0.5 |
Diluted | 42.1 |  |  | 44.8 |  |  | 42.7 |  |  | 45.0 |
Antidilutive stock awards and options excluded from denominator | — |  |  | — |  |  | — |  |  | — |
(a)We have deferred compensation plans for directors and certain of our employees. Some amounts owed to participants are denominated in common stock units. Each unit represents one share of common stock. The number of shares used to calculate basic earnings per share includes the weighted-average common stock units credited to employees and directors under the deferred compensation plans. Additionally, nonvested units containing only a service requirement are also included in the computation of basic weighted-average shares when the requisite service period has been completed. Accordingly, basic shares include weighted-average units of 0.2 million in the three months and 0.2 million in the nine months ended September 30, 2025, and 0.2 million in the three months and 0.2 million in the nine months ended September 30, 2024.

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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