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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders Equity Note [Abstract] |
Schedule of Common Stock Outstanding | Common stock outstanding as of December 31, 2018, 2017 and 2016 was as follows:
(Number of shares in millions) |  | 2018 |  |  | 2017 |  |  | 2016 |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 107.8 |  |  |  | 106.7 |  |  |  | 106.0 |
Activity under stock plans |  | 0.7 |  |  | 1.1 |  |  | 0.7 |
Balance, end of year |  | 108.5 |  |  |  | 107.8 |  |  |  | 106.7 |
Treasury stock: |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 18.2 |  |  | 15.3 |  |  | 12.5 |
Repurchased |  |  | 5.5 |  |  | 2.9 |  |  | 2.8 |
Balance, end of year |  | 23.7 |  |  | 18.2 |  |  | 15.3 |
Common stock outstanding |  | 84.8 |  |  | 89.6 |  |  | 91.4 |

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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=6488278&loc=d3e603758-122996 + Details
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