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Commitments, Contingent Liabilities and Other Matters - Noncontrolling Interest in South African Subsidiary (Details) ZAR in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 ZAR | Jul. 06, 2016 ZAR
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment related to redeemable noncontrolling interest | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 18.1 | $ 0.0 | $ 0.0 | $ 18.1 | $ 0.0 |  |
SPX Technologies | BEE Partner | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount due from BEE Partner under promissory note | ZAR |  |  |  |  |  |  |  |  |  |  |  |  | ZAR 30.3
SPX Technologies | BEE Partner | Put Option | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest percentage | 25.10% |  |  |  |  |  |  |  | 25.10% |  |  | 25.10% |
Amount entitled for Put Option exercise | ZAR |  |  |  |  |  |  |  |  |  |  |  |  | ZAR 287.3
Net redemption value | $ 20.9 |  |  |  | $ 18.5 |  |  |  | $ 20.9 | 18.5 |  | ZAR 257.0 |
Amount reclassified from non-controlling interest to paid in capital |  |  |  |  |  |  |  |  |  | 38.7 |  |  |
Adjustment related to redeemable noncontrolling interest |  |  | $ 18.1 |  |  |  |  |  |  | $ 18.1 |  |  |

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