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Shareholders' Equity and Long-Term Incentive Compensation - Income (Loss) Per Share (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Income from continuing operations	$ 69.7	$ 78.2	$ 84.0
Preferred Stock Dividends and Other Adjustments	5.6	0.0	0.0
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share	75.3	78.2	84.0
Income (loss) from discontinued operations, net of tax	(4.4)	3.0	5.3
Less: Net loss attributable to noncontrolling interest	0.0	0.0	0.0
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share	$ (4.4)	$ 3.0	$ 5.3
Denominator:
Weighted-average number of common shares used in basic income (loss) per share	43,942	43,054	42,413
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares)	1,015	1,606	1,492
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share	44,957	44,660	43,905
Unvested Restricted Stock And Restricted Stock Units that did not Meet Required Market Thresholds for Vesting
Denominator:
Number of awards that were excluded from the computation of diluted income per share (in shares)	319	234	563
Stock options
Denominator:
Number of awards that were excluded from the computation of diluted income per share (in shares)	942	875	997

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