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Short-term Investments	12 Months Ended
Dec. 31, 2020
Text Block [Abstract]
Short-term Investments	3. Short-term Investments Nucor held $408.0 million of short-term investments as of December 31, 2020 ($300.0 million as of December 31, 2019). The investments held as of December 31, 2020 and December 31, 2019 consisted mainly of several certificates of deposit (“CD’s”), commercial paper and corporate bonds, which were classified as available-for-sale. Interest income on the CD’s and corporate bonds was recorded as earned. No realized or unrealized gains or losses were incurred in 2020, 2019 or 2018.

Short-term Investments

12 Months Ended

Dec. 31, 2020

3. Short-term Investments

Nucor held $408.0 million of short-term investments as of December 31, 2020 ($300.0 million as of December 31, 2019). The investments held as of December 31, 2020 and December 31, 2019 consisted mainly of several certificates of deposit (“CD’s”), commercial paper and corporate bonds, which were classified as available-for-sale. Interest income on the CD’s and corporate bonds was recorded as earned.

No realized or unrealized gains or losses were incurred in 2020, 2019 or 2018.