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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Revenue from External Customer [Line Items]
Increase (decrease) in contract with customers, net					$ (14.0)
Contract with customer, revenue recognized	$ 14.8				79.0
Revenues	363.4	$ 364.8			1,105.9	$ 1,080.8
Operating Segments
Revenue from External Customer [Line Items]
Revenues	363.4	364.8			1,105.9	1,080.8
All Other
Revenue from External Customer [Line Items]
Revenues	0.5	6.0			6.5	(1.1)
All Other | Operating Segments
Revenue from External Customer [Line Items]
Revenues	$ 0.5	$ 6.0			6.5	(1.1)
Contracts Accounted for under Percentage of Completion | Large Power Projects | South Africa | All Other
Revenue from External Customer [Line Items]
Revenues				$ (17.5)	$ 0.3	$ (23.5)
Contracts Accounted for under Percentage of Completion | Large Power Projects | South Africa | All Other | Alstom S&E Africa (PTY) LTD
Revenue from External Customer [Line Items]
Revenues			$ (5.8)

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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.

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