REVENUES FROM CONTRACTS - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract Accounts Receivable	$ 226.6	$ 260.7
Increase (decrease) in accounts receivable	(34.1)
Contract Assets	75.8	81.1
Increase (decrease) in contract with customer, asset, net, current	(5.3)
Contract Liabilities - current	(106.7)	(103.5)
Increase (decrease) in contract with customer, liability, current	(3.2)
Contract Liabilities - non-current	(3.2)	(3.4)
Increase (decrease) in contract with customer, liability, noncurrent	0.2
Net contract balance	192.5	$ 234.9
Increase (decrease) in contract with customers, net	$ (42.4)