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STOCKHOLDERS' EQUITY - Share Based Comp (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 12, 2019 | Mar. 08, 2018 | Mar. 02, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based compensation arrangements |  |  |  |  |  |
Acquisition of Treasury Stock |  |  |  | $ 7.7 | $ 427.8 | $ 926.6
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Tax benefit related to stock-based compensation arrangements (in dollars) |  |  |  | $ 7.3 | 4.6 | 11.8
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 |  |  |  | 48.00% |  |
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 |  |  |  | 35.00% |  |
Restricted Stock Awards |  |  |  |  |  |
Assumptions used in valuation |  |  |  |  |  |
Unrecognized compensation costs (in dollars) |  |  |  | $ 37.0 |  |
Weighted average period of unrecognized compensation costs will be recognized (in years) |  |  |  | 1 year 8 months 12 days |  |
Total fair value of shares vested (in dollars) |  |  |  | $ 44.1 | $ 34.9 | $ 36.0
Restricted Stock Awards |  |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  |  |  | 2,976,227 |  |
Granted (in shares) |  |  |  | 1,137,983 |  |
Vested (in shares) |  |  |  | (1,432,294) |  |
Canceled or expired (in shares) |  |  |  | (239,656) |  |
Nonvested at the end of the period (in shares) |  |  |  | 2,442,260 | 2,976,227 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Nonvested at the beginning of the period (in dollars per shares) |  |  |  | $ 34.32 |  |
Granted (in dollars per shares) |  |  |  | 33.84 | $ 40.06 | $ 32.54
Vested (in dollars per shares) |  |  |  | 30.82 |  |
Cancelled or expired (in dollars per shares) |  |  |  | 32.76 |  |
Nonvested at the end of the period (in dollars per shares) |  |  |  | $ 35.53 | $ 34.32 |
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 |  |  |  | 17.00% |  |
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) |  |  |  | 2,300,000 |  |
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 [Member] [Domain] [Member] | 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 |  |  |  |  |
March 12, 2019 | Market Condition Award |  |  |  |  |  |
Assumptions used in valuation |  |  |  |  |  |
Dividend yields (as a percent) |  |  | 1.01% |  |  |
Expected volatility (as a percent) |  |  | 42.78% |  |  |
Risk-free interest rate (as a percent) |  |  | 1.55% |  |  |
Expected life (in years) |  |  | 3 years |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Granted (in dollars per shares) |  |  | $ 36.48 |  |  |
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 |  |  |  |
Share repurchase program approved by Board of Directors |  |  |  |  |  |
Share-based compensation arrangements |  |  |  |  |  |
Acquisition of Treasury Stock |  |  |  | $ 4.9 | $ 425.0 | $ 923.7
Acquisition of Treasury Stock (in shares) |  |  |  | 200,000 | 11,400,000 | 25,700,000

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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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