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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Income from continuing operations	$ 100.7	$ 71.1	$ 81.9
Adjustment related to redeemable noncontrolling interest	0.0	5.6	0.0
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share	100.7	76.7	81.9
Loss from discontinued operations, net of tax	(3.5)	(5.8)	(0.7)
Less: Net loss attributable to noncontrolling interest	0.0	0.0	0.0
Loss from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share	$ (3.5)	$ (5.8)	$ (0.7)
Denominator:
Weighted-average number of common shares used in basic income (loss) per share (in shares)	44,628	43,942	43,054
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares)	1,138	1,015	1,606
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share (in shares)	45,766	44,957	44,660
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)	300	319	234
Stock options
Denominator:
Number of awards that were excluded from the computation of diluted income per share (in shares)	793	942	875

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