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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity Note [Abstract] |
Schedule of Common Stock Outstanding | Common stock outstanding as of December 31, 2021, 2020 and 2019 was as follows:
(Number of shares in millions) |  | 2021 |  |  | 2020 |  |  | 2019 |
Common stock: |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 109.7 |  |  | 109.3 |  |  | 108.5 |
Activity under stock plans |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.8 |
Balance, end of year |  | 110.1 |  |  | 109.7 |  |  | 109.3 |
Treasury stock: |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 26.1 |  |  | 25.7 |  |  | 23.7 |
Repurchased |  |  | — |  |  |  | 0.4 |  |  |  | 2.0 |
Balance, end of year |  | 26.1 |  |  | 26.1 |  |  | 25.7 |
Common stock outstanding |  |  | 84.0 |  |  | 83.6 |  |  | 83.6 |

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- Definition Tabular disclosure of an entity's capital units or capital shares, including the value of capital units or capital shares, units authorized, units outstanding and other information necessary to a fair presentation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 + Details
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