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Shareholders' Equity and Long-Term Incentive Compensation - Income (Loss) Per Share (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Income from continuing operations $ 39.3 $ 6.8 $ 19.7 $ 12.4 $ 60.0 $ 22.0 $ (8.3) $ 10.3 $ 78.2 $ 84.0 $ 30.3
Less: Net loss attributable to noncontrolling interests                 0.0 0.0 (0.4)
Adjustment related to redeemable noncontrolling interest (Note 14)                 0.0 0.0 (18.1)
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share                 78.2 84.0 12.6
Income (loss) from discontinued operations, net of tax $ (0.1) $ (0.2) $ 3.3 $ 0.0 $ (1.4) $ 0.3 $ (0.7) $ 7.1 3.0 5.3 (97.9)
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                 $ 3.0 $ 5.3 $ (97.9)
Denominator:                      
Weighted-average number of common shares used in basic income (loss) per share                 43,054 42,413 41,610
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares)                 1,606 1,492 551
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share                 44,660 43,905 42,161
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)                 234 563 1,045
Stock options                      
Denominator:                      
Number of awards that were excluded from the computation of diluted income per share (in shares)                 875 997 1,343