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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Changes in Equity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Apr. 01, 2017
Changes in Equity |  |
Equity, beginning of period | $ 314.7 |
Net income | 12.4 | $ 17.4
Stranded income tax effects resulting from tax reform | (4.8) | 0.0
Equity, end of period | 333.2 |
Derivatives qualifying as hedges, tax | 0.4 | (0.4)
Defined benefit plan, after reclassification adjustment, tax | 4.9 | 0.0
SPX Corporation Shareholders' Equity |  |
Changes in Equity |  |
Equity, beginning of period | 314.7 | 191.6
Net income | 12.4 | 17.4
Net unrealized gains (losses) on qualifying cash flow hedges, net of tax (provision) benefit of $0.4 and $(0.4) for the three months ended March 31, 2018 and April 1, 2017, respectively | (0.5) | 0.7
Pension and postretirement liability adjustment, net of tax benefit of $4.9 for the three months ended March 31, 2018 | 3.9 | (0.2)
Foreign currency translation adjustments | 1.0 | (1.5)
Total comprehensive income, net | 16.8 | 16.4
Incentive plan activity | 3.0 | 3.8
Long-term incentive compensation expense | 3.0 | 2.8
Restricted stock and restricted stock unit vesting, net of tax withholdings | (3.3) | (3.6)
Equity, end of period | 333.2 | 211.0
Accounting Standards Update 2014-09 |  |
Changes in Equity |  |
Cumulative effect of new accounting principle in period of adoption |  | 0.0
Accounting Standards Update 2014-09 | SPX Corporation Shareholders' Equity |  |
Changes in Equity |  |
Cumulative effect of new accounting principle in period of adoption | 4.0 |
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

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- Definition Reclassification from Accumulated Other Comprehensive Income, Stranded Tax Effects Resulting from the Tax Cuts and Jobs Act + References No definition available. + Details
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- Definition Value of stock issued during the period as a result of the exercise of stock options and value of stock issued through a defined contribution plan, net of any related income tax benefit or expense recognized by the entity. + References No definition available. + Details
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- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11178-113907 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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