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Employee Benefit Plans - Overview (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 14, 2015 | Sep. 30, 2017 | Jul. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee benefit plans |  |  |  |  |  |
Amount of curtailment gain | $ 5.1 |  |  |  |  | $ 5.1
Charge to net periodic pension benefit expense from remeasurement of assets and liabilities of US Plan and SIARP |  |  |  |  |  | $ 11.4
Supplemental Individual Account Retirement Plan (SIARP) |  |  |  |  |  |
Employee benefit plans |  |  |  |  |  |
Percentage of projected benefit obligation that was settled |  |  | 22.00% |  |  |
Settlement charges |  |  | $ 2.7 |  |  |
Charge to net periodic pension benefit expense |  |  | $ 0.8 |  |  |
United States |  |  |  |  |  |
Employee benefit plans |  |  |  |  |  |
Settlement charges |  |  |  | $ 0.0 | $ 36.4 |
United States | SPX Flow, Inc | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |  |  |
Employee benefit plans |  |  |  |  |  |
Percentage of projected benefit obligation that was settled |  |  | 9.00% |  |  |
Settlement charges |  |  | $ 25.2 |  |  |
Charge to net periodic pension benefit expense |  |  | $ 1.0 |  |  |
U.S. Postretirement Plan (“OPEB”) |  |  |  |  |  |
Employee benefit plans |  |  |  |  |  |
Plan amendment |  | $ (26.8) |  | $ 26.8 |  |
(Increase) decrease for remeasurement due to settlement |  | $ 2.6 |  |  |  |

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- Definition Defined Benefit Plan, Settlements, Percentage of Projected Benefit Obligation + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from remeasurement due to settlement. Excludes decrease to benefit obligation for settlement payment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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