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Capital Stock - Additional Information (Detail) - USD ($) | 12 Months Ended | 159 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Oct. 27, 2006
Class of Stock [Line Items] |  |  |  |  |
Aggregate common stock and preferred stock authorized | 300,000,000 |  |  |  |
Common stock, authorized | 250,000,000.0 |  |  |  |
Common stock, par value | $ 1 |  |  |  |
Preferred Stock, authorized | 50,000,000 |  |  |  |
Preferred Stock, outstanding | 0 |  |  |  |
Dividends declared per common share | $ 0.676 | $ 0.588 | $ 0.536 |  |
Share repurchase program |  |  |  |  | $ 1,000,000,000
Shares repurchased | 1,700,000 | 500,000 | 1,000,000.0 | 24,500,000 |
Cost of shares repurchased | $ 84,200,000 | $ 41,400,000 | $ 56,100,000 | $ 1,011,000,000.0 |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased | 1,900,000 | 800,000 | 1,100,000 |  |
Cost of shares repurchased | $ 1,900,000 | $ 800,000 | $ 1,100,000 |  |
Share Repurchase Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cost of shares repurchased | $ 73,200,000 | $ 28,700,000 | $ 50,000,000.0 |  |
2006 Share Repurchase Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased | 1,500,000 |  |  |  |
Cost of shares repurchased | $ 61,900,000 |  |  |  |
Settlement of Tax Withholding on Employee Equity Compensation [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased | 200,000 | 300,000 | 100,000 |  |
Cost of shares repurchased | $ 11,000,000.0 | $ 12,700,000 | $ 6,100,000 |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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