SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Indefinite and Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Intangible Assets [Line Items]
Gross carrying amount	$ 560.4	$ 511.0
Accumulated amortization	(167.5)	(132.2)
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross carrying amount	500.1	464.5
Accumulated amortization	(143.7)	(113.2)
Exclusive Supplier Agreement [Member]
Intangible Assets [Line Items]
Gross carrying amount	22.1	22.5
Accumulated amortization	(4.5)	(3.5)
Trade Names [Member]
Intangible Assets [Line Items]
Gross carrying amount, finite trade names	21.8	12.8
Accumulated amortization	(12.6)	(10.2)
Non-compete Agreements [Member]
Intangible Assets [Line Items]
Gross carrying amount	9.2	6.3
Accumulated amortization	(6.5)	(5.3)
Intellectual Property [Member]
Intangible Assets [Line Items]
Gross carrying amount	2.3	0.0
Accumulated amortization	(0.2)	0.0
Indefinite-Lived Trade Names [Member]
Intangible Assets [Line Items]
Gross carrying amount	$ 4.9	$ 4.9
Minimum [Member] | Customer Relationships [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years
Minimum [Member] | Trade Names [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] | Non-compete Agreements [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member] | Customer Relationships [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] | Exclusive Supplier Agreement [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	21 years
Maximum [Member] | Trade Names [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum [Member] | Non-compete Agreements [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member] | Intellectual Property [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years