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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, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Income (loss) from continuing operations	$ (40.0)	$ 66.7	$ 56.7	$ 296.7	$ 85.1	$ 66.6	$ 43.5	$ 16.1	$ 380.1	$ 211.3	$ (165.2)
Less: Net income (loss) attributable to noncontrolling interests									(9.5)	2.2	3.0
Income (loss) from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share									389.6	209.1	(168.2)
Income (loss) from discontinued operations, net of tax	(3.2)	(2.9)	(6.7)	21.1	1.8	1.9	3.7	(6.1)	8.3	1.3	348.4
Less: Net income (loss) attributable to noncontrolling interest										0.2	(0.2)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total									$ 8.3	$ 1.1	$ 348.6
Denominator:
Weighted-average number of common shares used in basic income per share									42,400	45,384	50,031
Dilutive securities - Employee stock options, restricted stock shares and restricted stock units (in shares)									631	622
Weighted-average number of common shares and dilutive securities used in diluted income per share									43,031	46,006	50,031
Stock options
Stock-based Compensation
Options outstanding (in shares)	0				0				0	0
Number of options or units that were excluded from the computation of diluted income per share											3
Restricted stock shares and restricted stock units
Stock-based Compensation
Number of options or units that were excluded from the computation of diluted income per share									226	647	1,031