CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (93.1)	$ 44.7	$ 46.8
Other comprehensive income (loss), net:
Net unrealized gains (losses) on qualifying cash flow hedges, net of tax	0.1	(0.3)	0.0
Foreign currency translation adjustments	3.8	(50.7)	149.3
Other comprehensive income (loss), net	3.9	(51.0)	149.3
Total comprehensive income (loss)	(89.2)	(6.3)	196.1
Less: Total comprehensive income attributable to noncontrolling interests	1.7	0.3	1.1
Total comprehensive income (loss) attributable to SPX FLOW, Inc.	$ (90.9)	$ (6.6)	$ 195.0