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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Changes in Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Changes in Equity |  |  |  |
Equity, beginning of period |  |  | $ 314.7 |
Net income | $ 6.6 | $ 22.3 | 42.0 | $ 30.7
Equity, end of period | 369.7 |  | 369.7 |
Derivatives qualifying as hedges, tax | 0.0 | 0.3 | 0.6 | (0.2)
Defined benefit plan, after reclassification adjustment, tax | 0.1 | (10.3) | 5.3 | (10.2)
SPX Corporation Shareholders' Equity |  |  |  |
Changes in Equity |  |  |  |
Equity, beginning of period | 358.6 | 208.7 | 314.7 | 191.6
Net income | 6.6 | 22.3 | 42.0 | 30.7
Net unrealized gains (losses) on qualifying cash flow hedges, net of tax (provision) benefit of $0.6 and ($0.2) for the nine months ended September 29, 2018 and September 30, 2017, respectively | (0.1) | 0.5 | (1.1) | 0.3
Pension and postretirement liability adjustment, net of tax (provision) benefit of $5.3 and $(10.2) for the nine months ended September 29, 2018 and September 30, 2017, respectively | (0.9) | 16.2 | 2.3 | 15.9
Foreign currency translation adjustments | 0.0 | 2.4 | (0.8) | 2.0
Total comprehensive income | 5.6 | 41.4 | 42.4 | 48.9
Stranded income tax effects resulting from tax reform |  |  | (4.8) | 0.0
Incentive plan activity | 2.5 | 2.0 | 7.8 | 9.4
Long-term incentive compensation expense | 3.3 | 3.0 | 9.4 | 8.8
Restricted stock and restricted stock unit vesting, net of tax withholdings | (0.3) | (0.1) | (3.6) | (3.7)
Equity, end of period | 369.7 | 255.0 | 369.7 | 255.0
Accounting Standards Update 2014-09 | SPX Corporation Shareholders' Equity |  |  |  |
Changes in Equity |  |  |  |
Cumulative effect of new accounting principle in period of adoption | 4.0 | 0.0 | 4.0 | 0.0
Accounting Standards Update 2016-16 | SPX Corporation Shareholders' Equity |  |  |  |
Changes in Equity |  |  |  |
Cumulative effect of new accounting principle in period of adoption | $ (0.2) | $ 0.0 | $ (0.2) | $ 0.0

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