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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Increase (decrease) in contract with customers, net	$ (48.0)
Contract with customer, revenue recognized	27.4
Revenues	343.6	$ 351.9
All Other
Revenue from External Customer [Line Items]
Revenues	(7.9)	$ 30.8
Large Power Projects | SOUTH AFRICA
Revenue from External Customer [Line Items]
Revenues related to claims and unapproved change orders	19.9
Contracts Accounted for under Percentage of Completion | Large Power Projects | SOUTH AFRICA | All Other | Operating Segments
Revenue from External Customer [Line Items]
Revenues	$ (17.5)

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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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