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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Revenue from External Customer [Line Items] |  |  |  |  |  |
Increase (decrease) in contract with customers, net |  |  |  |  | $ (50.8) |
Contract with customer, revenue recognized | $ 10.2 |  |  |  | 54.5 |
Revenues | 364.8 |  |  | $ 362.5 | 1,080.8 | $ 1,093.6
All Other |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Revenues | 6.0 |  |  | 21.4 | (1.1) | 81.7
Contracts Accounted for under Percentage of Completion | Large Power Projects | South Africa | All Other | Operating Segments |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Revenues |  | $ (6.0) | $ (17.5) |  |  |
Alstom/GE | Contracts Accounted for under Percentage of Completion | Large Power Projects | South Africa | All Other | Operating Segments |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Revenues |  | $ (5.8) |  |  |  |
Transferred over Time |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Revenues | 120.7 |  |  | 133.9 | 374.7 | 430.5
Transferred over Time | All Other |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Revenues | 5.6 |  |  | $ 19.5 | (3.1) | $ 77.1
Transferred over Time | Contracts Accounted for under Percentage of Completion | Large Power Projects | South Africa | All Other | Operating Segments |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Revenues | $ 9.8 |  |  |  | $ (23.5) |

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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