REVENUES FROM CONTRACTS - Contract Balances (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract Accounts Receivable	$ 223.2	$ 260.8
Increase (decrease) in accounts receivable	(37.6)
Contract assets	70.3	63.4
Increase (decrease) in contract with customer, asset, net, current	6.9
Contract Liabilities - current	(83.3)	(100.8)
Increase (decrease) in contract with customer, liability, current	17.5
Contract Liabilities - non-current	(4.1)	(3.3)
Increase (decrease) in contract with customer, liability, noncurrent	(0.8)
Net contract balance	206.1	$ 220.1
Increase (decrease) in contract with customers, net	$ (14.0)