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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Mar. 30, 2019	Jun. 27, 2020	Jun. 29, 2019
Revenue from External Customer [Line Items]
Increase (decrease) in contract with customers, net				$ (17.3)
Contract with customer, revenue recognized	$ 19.6			64.2
Revenues	373.2	$ 372.4		742.5	$ 716.0
All Other
Revenue from External Customer [Line Items]
Revenues	$ 2.0	0.8		6.0	(7.1)
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)	$ 0.3	$ (23.5)
Contracts Accounted for under Percentage of Completion | Large Power Projects | South Africa | All Other | Operating Segments | Alstom S&E Africa (PTY) LTD
Revenue from External Customer [Line Items]
Revenues		$ (5.8)

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