STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended		10 Months Ended	9 Months Ended	0 Months Ended		3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014 Restricted Stock	Feb. 26, 2014 Market Condition Award [Member]	Sep. 30, 2014 Market Condition Award [Member]	Dec. 31, 2014 Subsequent Event [Member]
Net income	$ 64.2			$ 93.7	$ 238.5	$ 135.6
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment (CTA), net of (provision for) benefit from taxes of $9.2, $1.1, $11.0 and $(1.8), respectively	(176.3)			90.7	(134.6)	(26.4)
Cumulative translation adjustment, tax	9.2			1.1	11.0	(1.8)
Derivative hedging adjustment, net of (provision for) benefit from taxes of $1.7, $(1.5), $2.7 and $(0.9), respectively	(0.3)			0.6	(2.5)	3.5
Derivative hedging adjustment, tax	1.7			(1.5)	2.7	(0.9)
Debt and equity securities adjustment, net of (provision for) benefit from taxes of $0.0, $0.0, $0.0 and $0.6, respectively	0.1			0	0.1	(1.9)
Debt and equity securities adjustment, tax	0			0	0	0.6
Pension Liability adjustment:
Amortization of actuarial (gain) loss, net of provision for (benefit from) taxes of $(0.4), $(0.8), $(1.4) and $(2.3), respectively	0.8			1.7	3.0	5.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	(0.4)			(0.8)	(1.4)	(2.3)
Foreign exchange and other effects, net of (provision for) benefit from taxes of $(1.6). $1.4, $(3.0) and $1.2, respectively	4.9			(3.4)	4.3	(2.6)
Foreign exchange and other effects, tax	(1.6)			1.4	(3.0)	1.2
Total pension liability adjustment	5.7			(1.7)	7.3	2.7
Other comprehensive income (loss)	(170.8)			89.6	(129.7)	(22.1)
Comprehensive income (loss)	(106.6)			183.3	108.8	113.5
Comprehensive loss (income) attributable to noncontrolling interest	0			0.7	0.9	4.0
Comprehensive income (loss) attributable to Terex Corporation	(106.6)			184.0	109.7	117.5
Share-based compensation
Granted (in shares)								1.0
Granted (in dollars per shares)								$ 44.51	$ 53.17
Percentage of awards that vest over a three year period (as a percent)								63.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period [in years]								3 years
Percentage of awards that vest at end of three year period (as a percent)								37.00%
Percentage of awards subject to performance conditions (as a percent)										11.00%
Dividend yields (as a percent)									0.46%
Expected volatility (as a percent)									56.84%
Risk-free interest rate (as a percent)									0.63%
Expected life (in years)									3 years
Stock Repurchase Program, Authorized Amount	200				200		200
Treasury Stock, Shares, Acquired					1.6		2.4
Treasury Stock, Value, Acquired, Cost Method					$ 65		$ 95
Dividends declared per common share	$ 0.05	$ 0.05	$ 0.05	$ 0.00	$ 0.15	$ 0.00					$ 0.05