REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Percentage of unbilled revenue billed during period	85.00%	75.00%
Amount of unbilled revenue billed during period	$ 204.0	$ 161.0
Percentage of contract liabilities recognized as revenue during period	75.00%	75.00%
Contract with customer, liability, revenue recognized, including opening balance	$ 290.0
Amount of contract liabilities recognized as revenue		$ 240.0
Unpaid advanced client billings	42.0		$ 54.0
Accounts receivable, credit loss expense (reversal)	9.1	$ 0.4
Performance obligations expected to be satisfied	$ 1,029.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-02
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	50.00%
Performance obligations expected to be satisfied, expected timing	12 months