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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, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ (179.2) | $ 54.1 | $ 38.5 | $ 8.2 | $ 58.5 | $ 50.8 | $ 25.5 | $ 20.8 | $ (78.4) | $ 155.6 | $ 178.0
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 2.8 | 5.0 | (2.8)
Income (loss) from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted earnings per share |  |  |  |  |  |  |  |  | (81.2) | 150.6 | 180.8
Income from discontinued operations | 320.0 | 6.1 | 9.7 | 4.6 | 5.0 | 11.5 | 9.5 | 4.0 | 340.4 | 30.0 | 24.8
Income from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted earnings per share |  |  |  |  |  |  |  |  | $ 340.4 | $ 30.0 | $ 24.8
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares used in basic earnings per share |  |  |  |  |  |  |  |  | 50,031 | 50,499 | 49,718
Dilutive securities - Employee stock options and restricted stock units |  |  |  |  |  |  |  |  |  | 447 | 629
Weighted-average number of common and dilutive securities used for calculating diluted income per share |  |  |  |  |  |  |  |  | 50,031 | 50,946 | 50,347
Stock options |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
The number of options or units that were excluded from the computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 3 | 117 | 405
Restricted stock and restricted stock units |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
The number of options or units that were excluded from the computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 1,031 | 633 | 102

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