PENSION PLANS - Change in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 448.9	$ 489.9
Ending balance	515.5	448.9
Property/real estate
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	33.0
Ending balance	59.0	33.0
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	32.7	0.0
Actual return on plan assets	3.1
Purchases, sales and settlements	9.5	32.7
Ending balance	45.3	32.7
Level 3 [Member] | Property/real estate
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	32.7	0.0
Actual return on plan assets	3.1
Purchases, sales and settlements	9.5	32.7
Ending balance	$ 45.3	$ 32.7