CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Common Stock in Treasury	Total SPX FLOW, Inc. Shareholders' Equity	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2016		41,900,000
Beginning balance at Dec. 31, 2016	$ 742.1	$ 0.4	$ 1,640.4	$ (373.9)	$ (521.4)	$ (4.9)	$ 740.6	$ 1.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	46.8			46.4			46.4	0.4
Other comprehensive income (loss), net	149.3				148.6		148.6	0.7
Incentive plan activity (in shares)		200,000
Incentive plan activity	5.7		5.7				5.7
Stock-based compensation expense	15.9		15.9				15.9
Restricted stock and restricted stock unit vesting, net of tax withholdings (in shares)		300,000
Restricted stock and restricted stock unit vesting, net of tax withholdings	(7.3)		(3.3)			(4.0)	(7.3)
Adjustment to mezzanine equity and reclassification to noncontrolling interests	0.4		(7.8)				(7.8)	8.2
Dividends attributable to noncontrolling interests	(1.1)							(1.1)
Ending balance (in shares) at Dec. 31, 2017		42,400,000
Ending balance at Dec. 31, 2017	951.8	$ 0.4	1,650.9	(327.5)	(372.8)	(8.9)	942.1	9.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	44.7			44.0			44.0	0.7
Other comprehensive income (loss), net	(51.0)				(50.6)		(50.6)	(0.4)
Incentive plan activity (in shares)		0
Incentive plan activity	2.4		2.4				2.4
Stock-based compensation expense	15.7		15.7				15.7
Restricted stock and restricted stock unit vesting, net of tax withholdings (in shares)		100,000
Restricted stock and restricted stock unit vesting, net of tax withholdings	(5.0)					(5.0)	(5.0)
Adjustment to mezzanine equity and reclassification to noncontrolling interests	(0.7)		(0.7)				(0.7)
Acquisition of noncontrolling interest	(2.6)		(5.7)				(5.7)	3.1
Dividends attributable to noncontrolling interests	$ (2.8)							(2.8)
Ending balance (in shares) at Dec. 31, 2018	42,542,888	42,500,000
Ending balance at Dec. 31, 2018	$ 963.1	$ 0.4	1,662.6	(265.6)	(430.7)	(13.9)	952.8	10.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(93.1)			(95.1)			(95.1)	2.0
Other comprehensive income (loss), net	3.9				4.2		4.2	(0.3)
Stock-based compensation expense	13.7		13.7				13.7
Restricted stock and restricted stock unit vesting, net of tax withholdings (in shares)		100,000
Restricted stock and restricted stock unit vesting, net of tax withholdings	(5.4)					(5.4)	(5.4)
Adjustment to mezzanine equity and reclassification to noncontrolling interests	0.7		0.7				0.7
Dividends attributable to noncontrolling interests	$ (1.3)							(1.3)
Ending balance (in shares) at Dec. 31, 2019	42,566,884	42,600,000
Ending balance at Dec. 31, 2019	$ 873.1	$ 0.4	$ 1,677.0	$ (369.2)	$ (426.5)	$ (19.3)	$ 862.4	$ 10.7