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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)