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Shareholders' Equity and Long-Term Incentive Compensation - Income (Loss) Per Share (Details) - USD ($) shares in Thousands, $ 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
Numerator: |  |  |  |  |  |  |  |  |  |  |
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)
Less: Net loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0.0 | (0.4) | (33.4)
Adjustment related to redeemable noncontrolling interest (Note 13) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | (18.1) | 0.0 | 0.0 | (18.1) | 0.0
Income (loss) from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share |  |  |  |  |  |  |  |  | 84.0 | 12.6 | (118.2)
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
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.9)
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share |  |  |  |  |  |  |  |  | $ 5.3 | $ (97.9) | $ 35.5
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares used in basic income (loss) per share |  |  |  |  |  |  |  |  | 42,413 | 41,610 | 40,733
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units |  |  |  |  |  |  |  |  | 1,492 | 551 | 0
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share |  |  |  |  |  |  |  |  | 43,905 | 42,161 | 40,733
Unvested Restricted Stock And Restricted Stock Units that did not Meet Required Market Thresholds for Vesting |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |
Number of awards that were excluded from the computation of diluted income per share |  |  |  |  |  |  |  |  | 563 | 1,045 | 553
Restricted stock shares and restricted stock units |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |
Number of awards that were excluded from the computation of diluted income per share |  |  |  |  |  |  |  |  |  |  | 351
Stock options |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |
Number of awards that were excluded from the computation of diluted income per share |  |  |  |  |  |  |  |  | 997 | 1,343 | 505

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