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Shareholders' Equity and Long-Term Incentive Compensation - Income (Loss) Per Share (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |
Income from continuing operations | $ 100.7 | $ 71.1 | $ 81.9
Adjustment related to redeemable noncontrolling interest | 0.0 | 5.6 | 0.0
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share | 100.7 | 76.7 | 81.9
Loss from discontinued operations, net of tax | (3.5) | (5.8) | (0.7)
Less: Net loss attributable to noncontrolling interest | 0.0 | 0.0 | 0.0
Loss from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share | $ (3.5) | $ (5.8) | $ (0.7)
Denominator: |  |  |
Weighted-average number of common shares used in basic income (loss) per share (in shares) | 44,628 | 43,942 | 43,054
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares) | 1,138 | 1,015 | 1,606
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share (in shares) | 45,766 | 44,957 | 44,660
Unvested Restricted Stock And Restricted Stock Units that did not Meet Required Market Thresholds for Vesting |  |  |
Denominator: |  |  |
Number of awards that were excluded from the computation of diluted income per share (in shares) | 300 | 319 | 234
Stock options |  |  |
Denominator: |  |  |
Number of awards that were excluded from the computation of diluted income per share (in shares) | 793 | 942 | 875

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