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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Plans Activity | A summary of activity under Nucor’s stock option plans is as follows (shares in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  |  |  |  |  | Exercise |  |  |  |  |  |  | Exercise |  |  |  |  |  |  | Exercise |
Year Ended December 31, |  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Number of shares under stock options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year |  |  | 3,892 |  |  | $ | 50.78 |  |  |  | 3,828 |  |  | $ | 49.71 |  |  |  | 4,106 |  |  | $ | 47.96 |
Granted |  |  | 529 |  |  | $ | 42.46 |  |  |  | 489 |  |  | $ | 48.00 |  |  |  | 265 |  |  | $ | 65.80 |
Exercised |  |  | (266 | ) |  | $ | 44.51 |  |  |  | (425 | ) |  | $ | 37.97 |  |  |  | (543 | ) |  | $ | 44.33 |
Canceled |  |  | (239 | ) |  | $ | 51.58 |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Outstanding at end of year |  |  | 3,916 |  |  | $ | 50.03 |  |  |  | 3,892 |  |  | $ | 50.78 |  |  |  | 3,828 |  |  | $ | 49.71 |
Stock options exercisable at end of year |  |  | 3,168 |  |  | $ | 50.85 |  |  |  | 3,276 |  |  | $ | 49.79 |  |  |  | 2,112 |  |  | $ | 45.41 |
Summary of Stock Options Outstanding | The following table summarizes information about stock options outstanding at December 31, 2020 (shares in thousands):
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Average |  | Weighted- |  |  |  |  |  |  | Weighted- |
Range of |  | Number |  |  | Remaining Contractual |  | Average Exercise |  |  | Number |  |  | Average Exercise |
Exercise Prices |  | Outstanding |  |  | Life |  | Price |  |  | Exercisable |  |  | Price |
$35.00 - $45.00 |  |  | 839 |  |  | 6.5 years |  | $ | 41.94 |  |  |  | 376 |  |  | $ | 41.30 |
$45.01 - $55.00 |  |  | 2,178 |  |  | 5.4 years |  | $ | 48.65 |  |  |  | 1,976 |  |  | $ | 48.71 |
$55.01 - $65.00 |  |  | 650 |  |  | 6.4 years |  | $ | 59.07 |  |  |  | 650 |  |  | $ | 59.07 |
$65.01 - $75.00 |  |  | 249 |  |  | 7.4 years |  | $ | 65.80 |  |  |  | 166 |  |  | $ | 65.80 |
$35.00 - $75.00 |  |  | 3,916 |  |  | 5.9 years |  | $ | 50.03 |  |  |  | 3,168 |  |  | $ | 50.85 |
Schedule of Grant Date Fair Value Black-Scholes Options-Pricing Model Assumptions | The fair value was estimated using the Black-Scholes options pricing model with the following assumptions:
|  | 2020 |  | 2019 |  | 2018
Exercise price |  | $42.46 |  | $48.00 |  | $65.80
Expected dividend yield |  | 3.79% |  | 3.33% |  | 2.31%
Expected stock price volatility |  | 30.12% |  | 25.57% |  | 25.28%
Risk-free interest rate |  | 0.50% |  | 2.03% |  | 2.85%
Expected life (in years) |  | 6.5 |  | 6.5 |  | 6.5
Summary of Nucor's RSU Activity | A summary of Nucor’s RSU activity is as follows (shares in thousands):
|  | 2020 |  | 2019 |  | 2018
|  |  |  | Grant Date |  |  |  | Grant Date |  |  |  | Grant Date
Year Ended December 31, |  | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
Restricted stock units: |  |  |  |  |  |  |  |  |  |  |  |
Unvested at beginning of year |  | 1,776 |  | $52.60 |  | 1,246 |  | $59.09 |  | 1,071 |  | $52.62
Granted |  | 1,246 |  | $42.46 |  | 1,770 |  | $48.00 |  | 1,013 |  | $65.80
Vested |  | (1,166) |  | $50.10 |  | (1,207) |  | $52.43 |  | (827) |  | $58.98
Canceled |  | (26) |  | $49.75 |  | (33) |  | $57.09 |  | (11) |  | $55.02
Unvested at end of year |  | 1,830 |  | $47.33 |  | 1,776 |  | $52.60 |  | 1,246 |  | $59.09
Summary of Nucor's Restricted Stock Activity under AIP and LTIP | A summary of Nucor’s restricted stock activity under the AIP and the LTIP is as follows (shares in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |
Year Ended December 31, |  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Restricted stock units and restricted stock awards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested at beginning of year |  |  | 147 |  |  | $ | 60.81 |  |  |  | 130 |  |  | $ | 62.97 |  |  |  | 91 |  |  | $ | 54.50 |
Granted |  |  | 348 |  |  | $ | 36.15 |  |  |  | 316 |  |  | $ | 58.04 |  |  |  | 256 |  |  | $ | 67.68 |
Vested |  |  | (368 | ) |  | $ | 41.22 |  |  |  | (299 | ) |  | $ | 58.82 |  |  |  | (217 | ) |  | $ | 64.95 |
Canceled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Unvested at end of year |  |  | 127 |  |  | $ | 49.94 |  |  |  | 147 |  |  | $ | 60.81 |  |  |  | 130 |  |  | $ | 62.97 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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