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Quarterly Results (Unaudited) (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |
Operating revenues | $ 444,600,000 | $ 364,800,000 | $ 372,400,000 | $ 343,600,000 | $ 445,000,000.0 | $ 362,500,000 | $ 379,200,000 | $ 351,900,000
Gross profit (loss) | 143,500,000 | 106,200,000 | 108,200,000 | 83,200,000 | 135,200,000 | 87,700,000 | 97,700,000 | 90,100,000
Income from continuing operations | 28,500,000 | 21,200,000 | 19,400,000 | 600,000 | 39,300,000 | 6,800,000 | 19,700,000 | 12,400,000
Income (loss) from discontinued operations, net of tax | (3,100,000) | 300,000 | (200,000) | (1,400,000) | (100,000) | (200,000) | 3,300,000 | 0
Net income | 25,400,000 | 21,500,000 | 19,200,000 | (800,000) | 39,200,000 | 6,600,000 | 23,000,000.0 | 12,400,000
Less: Net loss attributable to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Net income attributable to SPX Corporation common shareholders | 25,400,000 | 21,500,000 | 19,200,000 | (800,000) | 39,200,000 | 6,600,000 | 23,000,000.0 | 12,400,000
Preferred Stock Dividends and Other Adjustments | 5,600,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Net income attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest | $ 31,000,000.0 | $ 21,500,000 | $ 19,200,000 | $ (800,000) | $ 39,200,000 | $ 6,600,000 | $ 23,000,000.0 | $ 12,400,000
Basic income (loss) per share of common stock: |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.77 | $ 0.48 | $ 0.44 | $ 0.01 | $ 0.91 | $ 0.16 | $ 0.46 | $ 0.29
Discontinued operations, net of tax (in dollars per share) | (0.07) | 0.01 | 0 | (0.03) | (0.01) | (0.01) | 0.08 | 0
Net income per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share) | 0.70 | 0.49 | 0.44 | (0.02) | 0.90 | 0.15 | 0.54 | 0.29
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | 0.75 | 0.47 | 0.43 | 0.01 | 0.88 | 0.15 | 0.44 | 0.28
Discontinued operations, net of tax (in dollars per share) | (0.07) | 0.01 | 0 | (0.03) | 0 | 0 | 0.07 | 0
Net income per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share) | $ 0.68 | $ 0.48 | $ 0.43 | $ (0.02) | $ 0.88 | $ 0.15 | $ 0.51 | $ 0.28
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Reduction of revenue | $ (444,600,000) | $ (364,800,000) | $ (372,400,000) | $ (343,600,000) | $ (445,000,000.0) | $ (362,500,000) | $ (379,200,000) | $ (351,900,000)
Recognized pre-tax actuarial losses | 10,000,000.0 |  |  |  | 6,600,000 |  |  |
Gain on change in fair value of equity security |  |  | 1,600,000 | 6,300,000 |  |  |  |
Recorded charges related to asbestos product liability matters | $ 8,300,000 |  |  |  | $ 2,400,000 |  |  |
Balcke Durr |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  |  |  |  | $ 3,800,000 |
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 |  |  | (6,000,000.0) | (17,500,000) |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Reduction of revenue |  |  | 6,000,000.0 | $ 17,500,000 |  |  |  |
Alstom GE | 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 |  |  | (6,000,000.0) |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |
Reduction of revenue |  |  | $ 6,000,000.0 |  |  |  |  |

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