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