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Quarterly Results (Unaudited) - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Sep. 26, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | $ (54.8) | $ (55.0) | $ 122.2
Reduction in revenues |  | $ (387.0) | $ (348.5) | $ (349.7) | $ (340.6) | $ (395.3) | $ (345.0) | $ (371.4) | $ (360.6) |  | (1,425.8) | (1,472.3) | (1,559.0)
Cost of products sold |  |  |  |  |  |  |  |  |  |  | 1,095.6 | 1,096.5 | 1,283.1
Gain on sale of dry cooling business |  |  |  |  |  |  |  |  |  |  | 0.0 | 18.4 | 0.0
Recognized pre-tax actuarial losses |  | 4.2 |  |  |  | 10.2 |  | 1.8 |  |  |  | 1.8 | 11.4
Gain on contract settlement |  |  |  |  |  |  |  |  |  |  | 10.2 | 0.0 | 0.0
Income tax expense (benefit) from loss on investment in Foreign Subsidiary |  |  |  |  |  |  |  |  |  |  | (77.6) |  |
Tax Cuts and Jobs Act of 2017, existing income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 11.8 |  |
Unamortized discount (premium) and debt issuance costs |  | 0.9 |  |  |  |  |  |  |  |  | 0.9 |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  | 2.0 | 0.3 | 10.0
Gain (loss) on sale of business, net of tax |  |  |  |  |  |  |  |  |  |  | (5.3) | 81.3 | 5.2
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 0.0 | (16.6) | 39.8
Adjustment related to redeemable noncontrolling interest |  | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 18.1 | 0.0 |  | 0.0 | 18.1 | 0.0
Engineered Solutions segment |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenues |  |  |  |  |  |  |  |  |  |  | (654.5) | (736.4) | (797.6)
Gain on contract settlement |  |  | 10.2 |  |  |  |  |  |  |  |  |  |
Reportable and other operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | (124.9) | (142.8) | (38.8)
Reportable and other operating segments | Engineered Solutions segment |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  |  | 12.6 | (17.3) | 87.4
South Africa |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in revenues |  |  |  |  |  |  |  |  |  |  | (56.9) | (105.4) | (54.2)
South Africa | Large Power Projects | Revisions in estimates for large power projects |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  |  |  |  |  |  |  |  |  | $ 95.0 |  |  |
Reduction in revenues |  |  |  |  |  |  |  |  |  | $ 57.2 |  |  | 57.2
Cost of products sold |  |  |  |  |  |  |  |  |  |  |  |  | 37.8
South Africa | Large Power Projects | Reportable and other operating segments | Engineered Solutions segment | Revisions in estimates for large power projects |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in segment income |  | 29.9 |  | 22.9 |  |  |  |  |  |  | 52.8 |  |
Reduction in revenues |  | 23.4 |  | 13.5 |  |  |  |  |  |  | 36.9 |  |
Cost of products sold |  | $ 6.5 |  | 9.4 |  |  |  |  |  |  | 15.9 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Dry Cooling Business |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of dry cooling business | $ 18.4 |  |  |  |  |  | $ 1.7 | $ 1.2 | 17.9 |  |  | 18.4 |
Discontinued Operations, Disposed of by Sale | Balcke Durr |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of business, net of tax |  |  |  |  |  | 78.6 |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  | 0.4 | $ 7.2 |  |  |  |  |  | 6.8 | (16.6) | $ (39.6)
SPX Heat Transfer Business |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | $ 26.1 |  |  | $ 4.0 |  |  |  |
U.S. Postretirement Plan (“OPEB”) |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease for remeasurement due to settlement |  |  | $ 2.6 |  |  |  |  |  |  |  |  |  |
BEE Partner | Put Option | SPX Technologies | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment related to redeemable noncontrolling interest |  |  |  | $ 18.1 |  |  |  |  |  |  |  | 18.1 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Amount Reclassified from AOCI | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  |  |  | $ 2.7 | $ 0.0 |

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