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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating 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
Gross profit (loss) | 80.9 | 85.1 | 76.1 | 88.1 | 114.0 | 80.8 | 91.1 | 89.9 |  |  |
Income (loss) from continuing operations | 60.0 | 22.0 | (8.3) | 10.3 | (3.0) | 6.6 | 6.5 | 20.2 | 84.0 | 30.3 | (151.6)
Income (loss) from discontinued operations, net of tax | (1.4) | 0.3 | (0.7) | 7.1 | (83.1) | (4.7) | (3.5) | (6.6) | 5.3 | (97.9) | 34.6
Net income (loss) | 58.6 | 22.3 | (9.0) | 17.4 | (86.1) | 1.9 | 3.0 | 13.6 | 89.3 | (67.6) | (117.0)
Less: Net loss attributable to noncontrolling interests | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | (1.0) | 0.6 | 0.0 | (0.4) | (34.3)
Net income (loss) attributable to SPX Corporation common shareholders | 58.6 | 22.3 | (9.0) | 17.4 | (86.1) | 1.9 | 4.0 | 13.0 | 89.3 | (67.2) | (82.7)
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
Net income (loss) attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest | $ 58.6 | $ 22.3 | $ (9.0) | $ 17.4 | $ (86.1) | $ 1.9 | $ (14.1) | $ 13.0 | $ 89.3 | $ (85.3) | $ (82.7)
Basic income (loss) per share of common stock: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 1.41 | $ 0.51 | $ (0.19) | $ 0.24 | $ (0.07) | $ 0.16 | $ (0.25) | $ 0.47 | $ 1.98 | $ 0.30 | $ (2.90)
Discontinued operations, net of tax (in dollars per share) | (0.03) | 0.01 | (0.02) | 0.17 | (1.99) | (0.12) | (0.09) | (0.16) | 0.13 | (2.35) | 0.87
Net income (loss) per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share) | 1.38 | 0.52 | (0.21) | 0.41 | (2.06) | 0.04 | (0.34) | 0.31 | 2.11 | (2.05) | (2.03)
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | 1.35 | 0.50 | (0.19) | 0.24 | (0.07) | 0.16 | (0.25) | 0.47 | 1.91 | 0.30 | (2.90)
Discontinued operations, net of tax (in dollars per share) | (0.03) | 0.01 | (0.02) | 0.16 | (1.99) | (0.12) | (0.09) | (0.16) | 0.12 | (2.32) | 0.87
Net income (loss) per share attributable to SPX Corporation common shareholders after adjustment related to redeemable noncontrolling interest (in dollars per share) | $ 1.32 | $ 0.51 | $ (0.21) | $ 0.40 | $ (2.06) | $ 0.04 | $ (0.34) | $ 0.31 | $ 2.03 | $ (2.02) | $ (2.03)

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