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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 |  |  |  |  |
43536 | 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 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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