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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Schedule of Common Stock Outstanding | Common stock outstanding as of December 31, 2023, 2022 and 2021 was as follows:
(Number of shares in millions) |  | 2023 |  |  | 2022 |  |  | 2021 |
Common stock: |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 110.4 |  |  | 110.1 |  |  | 109.7 |
Activity under stock plans |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.4 |
Balance, end of year |  | 110.8 |  |  | 110.4 |  |  | 110.1 |
Treasury stock: |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 26.2 |  |  | 26.1 |  |  | 26.1 |
Repurchased |  |  | 0.5 |  |  |  | 0.1 |  |  |  | — |
Balance, end of year |  | 26.7 |  |  | 26.2 |  |  | 26.1 |
Common stock outstanding |  |  | 84.1 |  |  |  | 84.2 |  |  |  | 84.0 |

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