STOCKHOLDERS' EQUITY AOCI (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	$ (116.5)
Current year change	(313.4)		8.0	1.9
Balance at the end of the period	(429.8)		(116.5)
Derivative Hedging Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Tax benefit included in accumulated other comprehensive income	(0.1)
Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Tax benefit included in accumulated other comprehensive income	54.2
Parent and Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	(115.6)		(123.6)	(125.5)
Other comprehensive income before reclassifications	(343.2)		9.0
Amounts reclassified from AOCI	29.8		(1.0)
Current year change	(313.4)		8.0	1.9
Balance at the end of the period	(429.0)		(115.6)	(123.6)
Parent and Noncontrolling Interest | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	(7.0)		14.6	(39.6)
Other comprehensive income before reclassifications	(264.6)		(19.0)
Amounts reclassified from AOCI	26.9	[1]	(2.6)
Current year change	(237.7)		(21.6)	54.2
Balance at the end of the period	(244.7)		(7.0)	14.6
Parent and Noncontrolling Interest | Derivative Hedging Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	2.7		(0.4)	(3.6)
Other comprehensive income before reclassifications	(1.4)		6.1
Amounts reclassified from AOCI	(2.0)		(3.0)
Current year change	(3.4)		3.1	3.2
Balance at the end of the period	(0.7)		2.7	(0.4)
Parent and Noncontrolling Interest | Debt and Equity Securities Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0		1.9	0.9
Other comprehensive income before reclassifications	1.6		0
Amounts reclassified from AOCI	0		(1.9)
Current year change	1.6		(1.9)	1.0
Balance at the end of the period	1.6		0	1.9
Parent and Noncontrolling Interest | Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	(111.3)		(139.7)	(83.2)
Other comprehensive income before reclassifications	(78.8)		21.9
Amounts reclassified from AOCI	4.9		6.5
Current year change	(73.9)		28.4	(56.5)
Balance at the end of the period	(185.2)		(111.3)	(139.7)
Terex Corporation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	(116.5)		(124.1)	(125.5)
Current year change	(313.3)		7.6	1.4
Balance at the end of the period	(429.8)		(116.5)	(124.1)
Terex Corporation | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	(7.9)		14.1	(39.6)
Current year change	(237.6)		(22.0)	53.7
Balance at the end of the period	(245.5)		(7.9)	14.1
Terex Corporation | Derivative Hedging Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	2.7		(0.4)	(3.6)
Current year change	(3.4)		3.1	3.2
Balance at the end of the period	(0.7)		2.7	(0.4)
Terex Corporation | Debt and Equity Securities Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0		1.9	0.9
Current year change	1.6		(1.9)	1.0
Balance at the end of the period	1.6		0	1.9
Terex Corporation | Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	(111.3)		(139.7)	(83.2)
Current year change	(73.9)		28.4	(56.5)
Balance at the end of the period	(185.2)		(111.3)	(139.7)
Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0.9		0.5	0
Current year change	(0.1)		0.4	0.5
Balance at the end of the period	0.8		0.9	0.5
Noncontrolling Interest | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0.9		0.5	0
Current year change	(0.1)		0.4	0.5
Balance at the end of the period	0.8		0.9	0.5
Noncontrolling Interest | Derivative Hedging Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0		0	0
Current year change	0		0	0
Balance at the end of the period	0		0	0
Noncontrolling Interest | Debt and Equity Securities Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0		0	0
Current year change	0		0	0
Balance at the end of the period	0		0	0
Noncontrolling Interest | Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance at the beginning of the period	0		0	0
Current year change	0		0	0
Balance at the end of the period	0		0	0
Selling, General and Administrative Expenses [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Amounts reclassified from AOCI	22.9	[1]
Gain (loss) on disposition of discontinued operations [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Amounts reclassified from AOCI	$ 4.0	[1]

[1] (1) Reclassification from dispositions of Demag Cranes and Components Pty. Ltd. and the truck business of $22.9 million and $4.0 million was recorded in Selling, general and administrative expenses and Gain (loss) on disposition of discontinued operations, respectively, for year ended December 31, 2014.