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Quarterly Results (Unaudited) (Details 2) (Adoption of new accounting method, USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012
Impact of change in accounting method |  |  |  |  |  |  |  |
Gross profit |  | $ 0.6 | $ 0.6 | $ 0.6 | $ (7.0) | $ 0.4 | $ 0.4 | $ 0.4
Income (loss) from continuing operations, net of tax | 254.4 | 6.1 | 6.1 | 6.1 | (92.6) | 5.2 | 5.2 | 5.2
Income (loss) from discontinued operations, net of tax | 2.2 | 0.3 | 0.3 | 0.3 | (1.2) | 0.3 | 0.2 | 0.3
Net income |  | 6.4 | 6.4 | 6.4 | (93.8) | 5.5 | 5.4 | 5.5
Net income attributable to SPX Corporation common shareholders |  | 6.4 | 6.4 | 6.4 | (93.8) | 5.5 | 5.4 | 5.5
Basic income (loss) per share of common stock: |  |  |  |  |  |  |  |
Continuing operations, net of tax (in dollars per share) |  | $ 0.14 | $ 0.13 | $ 0.13 | $ (1.87) | $ 0.10 | $ 0.10 | $ 0.10
Discontinued operations, net of tax (in dollars per share) |  |  | $ 0.01 | $ 0.01 | $ (0.02) | $ 0.01 | $ 0.01 | $ 0.01
Net income (in dollars per share) |  | $ 0.14 | $ 0.14 | $ 0.14 | $ (1.89) | $ 0.11 | $ 0.11 | $ 0.11
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |
Continuing operations, net of tax (in dollars per share) |  | $ 0.14 | $ 0.13 | $ 0.13 | $ (1.87) | $ 0.10 | $ 0.10 | $ 0.10
Discontinued operations, net of tax (in dollars per share) |  |  | $ 0.01 |  | $ (0.02) | $ 0.01 | $ 0.01 | $ 0.01
Net income (in dollars per share) |  | $ 0.14 | $ 0.14 | $ 0.13 | $ (1.89) | $ 0.11 | $ 0.11 | $ 0.11
Income from continuing operations, Pre-Tax | 412.0 |  |  |  |  |  |  |
Income from continuing operations, Tax Effect | (157.6) |  |  |  |  |  |  |
Income from discontinued operations, Pre-Tax | 2.4 |  |  |  |  |  |  |
Income from discontinued operations, Tax Effect | (0.2) |  |  |  |  |  |  |
Historical method |  |  |  |  |  |  |  |
Impact of change in accounting method |  |  |  |  |  |  |  |
Gross profit | 27.0 |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax | 254.4 |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | 2.2 |  |  |  |  |  |  |
Net income | 256.6 |  |  |  |  |  |  |
Net income attributable to SPX Corporation common shareholders | 256.6 |  |  |  |  |  |  |
Basic income (loss) per share of common stock: |  |  |  |  |  |  |  |
Continuing operations, net of tax (in dollars per share) | $ 5.68 |  |  |  |  |  |  |
Discontinued operations, net of tax (in dollars per share) | $ 0.05 |  |  |  |  |  |  |
Net income (in dollars per share) | $ 5.73 |  |  |  |  |  |  |
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |
Continuing operations, net of tax (in dollars per share) | $ 5.58 |  |  |  |  |  |  |
Discontinued operations, net of tax (in dollars per share) | $ 0.05 |  |  |  |  |  |  |
Net income (in dollars per share) | $ 5.63 |  |  |  |  |  |  |
Historical methods - pension and postretirement expense and related tax benefit |  |  |  |  |  |  |  |
Impact of change in accounting method |  |  |  |  |  |  |  |
Charge associated primarily with the November 2013 transfer of the pension obligations of the then-current retirees | 399.4 |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax | 251.3 |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | 0.2 |  |  |  |  |  |  |
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |
Income from continuing operations, Pre-Tax | 407.0 |  |  |  |  |  |  |
Income from continuing operations, Tax Effect | (155.7) |  |  |  |  |  |  |
Income from discontinued operations, Pre-Tax | 0.2 |  |  |  |  |  |  |
New methods - pension and postretirement income and related tax provision |  |  |  |  |  |  |  |
Impact of change in accounting method |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax | (3.1) |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | (2.0) |  |  |  |  |  |  |
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |
Income from continuing operations, Pre-Tax | (5.0) |  |  |  |  |  |  |
Income from continuing operations, Tax Effect | 1.9 |  |  |  |  |  |  |
Income from discontinued operations, Pre-Tax | (2.2) |  |  |  |  |  |  |
Income from discontinued operations, Tax Effect | $ 0.2 |  |  |  |  |  |  |

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