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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended									12 Months Ended
	Dec. 30, 2016	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Jul. 02, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Operating revenues		$ 445.0	$ 362.5	$ 379.2	$ 351.9	$ 387.0	$ 348.5	$ 349.7	$ 340.6		$ 1,538.6	$ 1,425.8	$ 1,472.3
Gross profit (loss)		135.2	87.7	97.7	90.1	80.9	85.1	76.1	88.1
Income from continuing operations		39.3	6.8	19.7	12.4	60.0	22.0	(8.3)	10.3		78.2	84.0	30.3
Income (loss) from discontinued operations, net of tax		(0.1)	(0.2)	3.3	0.0	(1.4)	0.3	(0.7)	7.1		3.0	5.3	(97.9)
Net income (loss)		$ 39.2	$ 6.6	$ 23.0	$ 12.4	$ 58.6	$ 22.3	$ (9.0)	$ 17.4		$ 81.2	$ 89.3	$ (67.6)
Basic income (loss) per share of common stock:
Continuing operations (in dollars per share)		$ 0.91	$ 0.16	$ 0.46	$ 0.29	$ 1.41	$ 0.51	$ (0.19)	$ 0.24		$ 1.82	$ 1.98	$ 0.30
Discontinued operations, net of tax (in dollars per share)		(0.01)	(0.01)	0.08	0.00	(0.03)	0.01	(0.02)	0.17		0.07	0.13	(2.35)
Net income (loss) per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share)		0.90	0.15	0.54	0.29	1.38	0.52	(0.21)	0.41		1.89	2.11	(2.05)
Diluted income (loss) per share of common stock:
Continuing operations (in dollars per share)		0.88	0.15	0.44	0.28	1.35	0.50	(0.19)	0.24		1.75	1.91	0.30
Discontinued operations, net of tax (in dollars per share)		0.00	0.00	0.07	0.00	(0.03)	0.01	(0.02)	0.16		0.07	0.12	(2.32)
Net income (loss) per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share)		$ 0.88	$ 0.15	$ 0.51	$ 0.28	$ 1.32	$ 0.51	$ (0.21)	$ 0.40		$ 1.82	$ 2.03	$ (2.02)
Quarterly Financial Information [Line Items]
Reduction in segment income											$ (107.6)	$ (59.9)	$ (70.0)
Revenues		$ 445.0	$ 362.5	$ 379.2	$ 351.9	$ 387.0	$ 348.5	$ 349.7	$ 340.6		1,538.6	1,425.8	1,472.3
Cost of products sold											1,127.9	1,095.6	1,096.5
Gain on contract settlement											0.0	10.2	0.0
Recognized pre-tax actuarial losses		6.6				4.2				$ 1.8
Income tax benefit for worthless stock deduction						77.6
Provisional net charge due to new tax regulations						11.8						11.8
Gain (loss) on disposition of discontinued operations, net of tax											3.0	5.3	(81.3)
Engineered Solutions reportable segment
Quarterly Financial Information Disclosure [Abstract]
Operating revenues											537.0	560.7	598.0
Quarterly Financial Information [Line Items]
Revenues											537.0	560.7	598.0
Gain on contract settlement							10.2
All Other
Quarterly Financial Information Disclosure [Abstract]
Operating revenues											98.6	93.8	138.4
Quarterly Financial Information [Line Items]
Revenues											98.6	93.8	138.4
Reportable and other operating segments
Quarterly Financial Information [Line Items]
Reduction in segment income											(178.5)	(124.9)	(142.8)
Reportable and other operating segments | Engineered Solutions reportable segment
Quarterly Financial Information [Line Items]
Reduction in segment income											(35.0)	(44.2)	(39.1)
Reportable and other operating segments | All Other
Quarterly Financial Information [Line Items]
Reduction in segment income											18.9	56.8	21.8
South Africa
Quarterly Financial Information Disclosure [Abstract]
Operating revenues											72.7	56.9	105.4
Quarterly Financial Information [Line Items]
Revenues											72.7	56.9	105.4
South Africa | Large Power Projects | Reportable and other operating segments | Engineered Solutions reportable segment | Revisions in estimates for large power projects
Quarterly Financial Information Disclosure [Abstract]
Operating revenues			(2.7)
Quarterly Financial Information [Line Items]
Reduction in segment income			4.7			29.9		22.9
Revenues			(2.7)
Cost of products sold			$ 2.0			6.5		9.4
South Africa | Large Power Projects | Reportable and other operating segments | All Other | Revisions in estimates for large power projects
Quarterly Financial Information Disclosure [Abstract]
Operating revenues		(23.4)				(23.4)		(13.5)			(2.7)	(36.9)
Quarterly Financial Information [Line Items]
Reduction in segment income						29.9		22.9			4.7	52.8
Revenues		(23.4)				$ (23.4)		(13.5)			(2.7)	(36.9)
Cost of products sold		$ 6.5						9.4				15.9
U.S. Postretirement Plan (“OPEB”)
Quarterly Financial Information [Line Items]
(Increase) decrease for remeasurement due to settlement							$ 2.6
Balcke Durr
Quarterly Financial Information [Line Items]
Gain (loss) on disposition of discontinued operations, net of tax				3.8
Discontinued Operations, Disposed of by Sale | Balcke Durr
Quarterly Financial Information Disclosure [Abstract]
Income (loss) from discontinued operations, net of tax											$ 3.8	$ 6.8	$ (95.2)
Quarterly Financial Information [Line Items]
Gain (loss) on disposition of discontinued operations, net of tax				$ 3.8
Discontinued Operations, Disposed of by Sale | Balcke Durr | Subsidiary of mutares AG (the Buyer)
Quarterly Financial Information [Line Items]
Net loss recognized with disposition of business								$ 0.4	$ 7.2
Gain (loss) on disposition of discontinued operations, net of tax	$ (78.6)

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