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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator: |  |  |
Income from continuing operations | $ 69.7 | $ 78.2 | $ 84.0
Preferred Stock Dividends and Other Adjustments | 5.6 | 0.0 | 0.0
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share | 75.3 | 78.2 | 84.0
Income (loss) from discontinued operations, net of tax | (4.4) | 3.0 | 5.3
Less: Net loss attributable to noncontrolling interest | 0.0 | 0.0 | 0.0
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share | $ (4.4) | $ 3.0 | $ 5.3
Denominator: |  |  |
Weighted-average number of common shares used in basic income (loss) per share | 43,942 | 43,054 | 42,413
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares) | 1,015 | 1,606 | 1,492
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share | 44,957 | 44,660 | 43,905
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) | 319 | 234 | 563
Stock options |  |  |
Denominator: |  |  |
Number of awards that were excluded from the computation of diluted income per share (in shares) | 942 | 875 | 997

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