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Shareholders' Equity and Stock-Based Compensation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 84.4 | $ 63.1 | $ 39.2 | $ 14.6 | $ (275.7) | $ 53.8 | $ 35.5 | $ 9.8 | $ 201.3 | $ (176.6) | $ 132.7
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 2.2 | 3.0 | 5.0
Income (loss) from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share |  |  |  |  |  |  |  |  | 199.1 | (179.6) | 127.7
Income from discontinued operations | 2.5 | 5.4 | 8.0 | (4.6) | 321.0 | 12.0 | 18.2 | 8.6 | 11.3 | 359.8 | 43.5
Less: Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.2 | (0.2) |
Income from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share |  |  |  |  |  |  |  |  | $ 11.1 | $ 360.0 | $ 43.5
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares used in basic income per share |  |  |  |  |  |  |  |  | 45,384 | 50,031 | 50,499
Dilutive securities - Employee stock options, restricted stock shares and restricted stock units (in shares) |  |  |  |  |  |  |  |  | 622 |  | 447
Weighted-average number of common shares and dilutive securities used in diluted income per share |  |  |  |  |  |  |  |  | 46,006 | 50,031 | 50,946
Stock options |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |
Number of options or units that were excluded from the computation of diluted income per share |  |  |  |  |  |  |  |  |  | 3 | 117
Restricted stock shares and restricted stock units |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |
Number of options or units that were excluded from the computation of diluted income per share |  |  |  |  |  |  |  |  | 647 | 1,031 | 633

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