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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Shareholders' Equity and Stock-Based Compensation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2010	Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Numerator:
Income from continuing operations	$ 58.4	$ 50.8	$ 25.0	$ 20.7	$ 64.4	$ 35.0	$ 64.6	$ 14.0	$ 154.9	$ 178.0	$ 224.2
Less: Net income (loss) attributable to noncontrolling interests									5.0	(2.8)	1.8
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted earnings per share									149.9	180.8	222.4
Income (loss) from discontinued operations	5.1	11.5	10.0	4.1	(0.6)	4.7	13.4	7.3	30.7	24.8	(208.0)
Less: Net income (loss) attributable to noncontrolling interest											(17.3)
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted earnings per share									$ 30.7	$ 24.8	$ (190.7)
Denominator:
Weighted-average number of common shares used in basic earnings per share (in shares)									50,499	49,718	49,363
Dilutive Securities Employee stock options and restricted stock units (in shares)									447	629	434
Weighted-average number of common shares and dilutive securities used in diluted earnings per share									50,946	50,347	49,797
Stock options
Stock-Based Compensation
The number of options or units that were excluded from the computation of diluted earnings per share (in shares)									117	405	668
Restricted stock and restricted stock units
Stock-Based Compensation
The number of options or units that were excluded from the computation of diluted earnings per share (in shares)									633	102	222