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FAIR VALUE (Details) (USD $) In Millions	3 Months Ended	9 Months Ended												3 Months Ended	9 Months Ended			3 Months Ended
FAIR VALUE (Details) (USD $) In Millions	Jul. 02, 2011	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011 Fair Value Measurements Using Level 1 Noncurrent assets - Investment in equity securities and available-for-sale securities	Dec. 31, 2010 Fair Value Measurements Using Level 1 Noncurrent assets - Investment in equity securities and available-for-sale securities	Oct. 01, 2011 Fair Value Measurements Using Level 2 Current assets - FX embedded derivatives, FX forward contracts and commodity contracts	Dec. 31, 2010 Fair Value Measurements Using Level 2 Current assets - FX embedded derivatives, FX forward contracts and commodity contracts	Oct. 01, 2011 Fair Value Measurements Using Level 2 Current liabilities - FX forward contracts and FX embedded derivatives	Dec. 31, 2010 Fair Value Measurements Using Level 2 Current liabilities - FX forward contracts and FX embedded derivatives	Oct. 01, 2011 Fair Value Measurements Using Level 2 Long-term liabilities - FX embedded derivatives	Dec. 31, 2010 Fair Value Measurements Using Level 2 Long-term liabilities - FX embedded derivatives	Oct. 01, 2011 Fair Value Measurements Using Level 3 Noncurrent assets - Investment in equity securities and available-for-sale securities	Dec. 31, 2010 Fair Value Measurements Using Level 3 Noncurrent assets - Investment in equity securities and available-for-sale securities	Oct. 02, 2010 Test and Measurement	Oct. 01, 2011 Test and Measurement	Oct. 02, 2010 Test and Measurement	Oct. 01, 2011 Industrial Products and Services	Jul. 02, 2011 SPX Heat Transfer Inc.
Assets and liabilities measured at fair value on a recurring basis
Certain investments in equity securities that are not readily marketable, fair value												$ 7.2	$ 8.5
Fair value of derivative assets				5.1	12.8	1.9	4.1
Fair value of derivative liability								33.7	6.1	16.6	33.2
Impairments		17.2																17.2
Indefinite-lived intangible assets impairment loss																		7.5
Reconciliation of investment in equity securities measured at fair value using significant unobservable inputs
Balance at beginning of year		8.5
Losses included in earnings		(1.3)
Balance at end of year		7.2
Fair value of assets and liabilities
Special charges relating to asset impairments	24.7	4.6	4.3											1.6	3.7	1.6	0.8	24.7
Impairment charges of idle facility and certain machinery and equipment			4.3
Fair value of asset remaining		16.2
Fair value of trademark		1.2
Fair value of idle facility assets			5.5
Fair value of machinery and equipment			0.4
Fair value of our debt instruments		1,246.4
Carrying value of our debt instruments		$ 1,201.6