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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 29, 2019
Mar. 30, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Revenue from External Customer [Line Items]          
Increase (decrease) in contract with customers, net       $ (47.4)  
Contract with customer, revenue recognized $ 16.9     44.3  
Revenues 372.4   $ 379.2 716.0 $ 731.1
All Other          
Revenue from External Customer [Line Items]          
Revenues 0.8   $ 29.5 (7.1) $ 60.3
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)   $ 10.8  
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)