ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Accumulated other comprehensive income (loss):
Balance - beginning of period	$ (1,884.6)	$ (1,814.3)
Other comprehensive (loss) income before reclassifications	(260.0)	2.6
Reclassification adjustments to earnings	1.2	(1.6)
Net other comprehensive (loss) income	(258.8)	1.0
Balance - end of period	(2,143.4)	(1,813.3)
Currency translation adjustment and other
Accumulated other comprehensive income (loss):
Balance - beginning of period	(1,517.2)	(1,481.2)
Other comprehensive (loss) income before reclassifications	(258.4)	(18.9)
Reclassification adjustments to earnings	0.0	0.0
Net other comprehensive (loss) income	(258.4)	(18.9)
Balance - end of period	(1,775.6)	(1,500.1)
Unrealized (losses) gains on cash flow hedges, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	(54.2)	(26.8)
Other comprehensive (loss) income before reclassifications	(58.7)	(4.3)
Reclassification adjustments to earnings	1.4	2.1
Net other comprehensive (loss) income	(57.3)	(2.2)
Balance - end of period	(111.5)	(29.0)
Unrealized gains (losses) on net investment hedges, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	97.3	63.3
Other comprehensive (loss) income before reclassifications	43.0	29.2
Reclassification adjustments to earnings	(4.1)	(6.6)
Net other comprehensive (loss) income	38.9	22.6
Balance - end of period	136.2	85.9
Pension (losses) gains, net of tax
Accumulated other comprehensive income (loss):
Balance - beginning of period	(410.5)	(369.6)
Other comprehensive (loss) income before reclassifications	14.1	(3.4)
Reclassification adjustments to earnings	3.9	2.9
Net other comprehensive (loss) income	18.0	(0.5)
Balance - end of period	$ (392.5)	$ (370.1)