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STOCKHOLDERS' EQUITY - Share Based Comp (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 26, 2020 | Mar. 12, 2019 | Mar. 08, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 07, 2018
Share-based compensation arrangements |  |  |  |  |  |  |
Acquisition of Treasury Stock |  |  |  | $ 56,100,000 | $ 7,700,000 | $ 427,800,000 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Tax benefit related to stock-based compensation arrangements (in dollars) |  |  |  | $ 3,500,000 | 7,300,000 | 4,600,000 |
Common stock authorized to repurchase |  |  |  |  |  |  | $ 625
Restricted Stock, Time-Based |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Percentage Of Awards |  |  |  | 50.00% |  |  |
Performance Shares |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Percentage Of Awards |  |  |  | 34.00% |  |  |
Restricted Stock Awards |  |  |  |  |  |  |
Assumptions used in valuation |  |  |  |  |  |  |
Unrecognized compensation costs (in dollars) |  |  |  | $ 32,000,000 |  |  |
Weighted average period of unrecognized compensation costs will be recognized (in years) |  |  |  | 1 year 7 months 6 days |  |  |
Total fair value of shares vested (in dollars) |  |  |  | $ 37,200,000 | $ 44,100,000 | $ 34,900,000 |
Restricted Stock Awards |  |  |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  |  |  | 2,442,260 |  |  |
Granted (in shares) |  |  |  | 1,367,067 |  |  |
Vested (in shares) |  |  |  | (1,103,352) |  |  |
Canceled or expired (in shares) |  |  |  | (314,650) |  |  |
Nonvested at the end of the period (in shares) |  |  |  | 2,391,325 | 2,442,260 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Nonvested at the beginning of the period (in dollars per shares) |  |  |  | $ 35.53 |  |  |
Granted (in dollars per shares) |  |  |  | 22.42 | $ 33.84 | $ 40.06 |
Vested (in dollars per shares) |  |  |  | 33.73 |  |  |
Cancelled or expired (in dollars per shares) |  |  |  | 28.88 |  |  |
Nonvested at the end of the period (in dollars per shares) |  |  |  | $ 27.64 | $ 35.53 |  |
Market Condition Award |  |  |  |  |  |  |
Share-based compensation arrangements |  |  |  |  |  |  |
Number of shares of restricted stock with fair value based on market condition, instead of market price (in shares) |  |  |  | 400,000 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Percentage Of Awards |  |  |  | 16.00% |  |  |
Terex Corporation 2009 Omnibus Incentive Plan (the 2009 Plan) | Maximum |  |  |  |  |  |  |
Share-based compensation arrangements |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  | 8,000,000.0 |  |  |
Terex Corporation 2018 Omnibus Incentive Plan |  |  |  |  |  |  |
Share-based compensation arrangements |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  | 1,300,000 |  |  |
Terex Corporation 2018 Omnibus Incentive Plan | Maximum |  |  |  |  |  |  |
Share-based compensation arrangements |  |  |  |  |  |  |
Shares authorized for issuance (in shares) |  |  |  | 1,200,000 |  |  |
Grant Date, March 12, 2019 | Market Condition Award |  |  |  |  |  |  |
Assumptions used in valuation |  |  |  |  |  |  |
Dividend yields (as a percent) |  | 1.31% |  |  |  |  |
Expected volatility (as a percent) |  | 36.64% |  |  |  |  |
Risk-free interest rate (as a percent) |  | 2.40% |  |  |  |  |
Expected life (in years) |  | 3 years |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) |  | $ 38.77 |  |  |  |  |
Grant Date, March 8, 2018 | Market Condition Award |  |  |  |  |  |  |
Assumptions used in valuation |  |  |  |  |  |  |
Dividend yields (as a percent) |  |  | 1.00% |  |  |  |
Expected volatility (as a percent) |  |  | 40.41% |  |  |  |
Risk-free interest rate (as a percent) |  |  | 2.38% |  |  |  |
Expected life (in years) |  |  | 3 years |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) |  |  | $ 41.57 |  |  |  |
Grant Date, February 26, 2020 | Market Condition Award |  |  |  |  |  |  |
Assumptions used in valuation |  |  |  |  |  |  |
Dividend yields (as a percent) | 2.12% |  |  |  |  |  |
Expected volatility (as a percent) | 36.36% |  |  |  |  |  |
Risk-free interest rate (as a percent) | 1.14% |  |  |  |  |  |
Expected life (in years) | 3 years |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per shares) | $ 21.09 |  |  |  |  |  |
Share repurchase program approved by Board of Directors |  |  |  |  |  |  |
Share-based compensation arrangements |  |  |  |  |  |  |
Acquisition of Treasury Stock |  |  |  | $ 54,600,000 | $ 4,900,000 | $ 425,000,000.0 |
Acquisition of Treasury Stock (in shares) |  |  |  | 2,500,000 | 200,000 | 11,400,000 |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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