EMPLOYEE SAVINGS PLANS AND MULTI-EMPLOYER PENSION PLANS - Schedule of Contributions to Significant Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Contributions	$ 14.5	$ 14.1	$ 13.8
Western Conference Teamster Pension Plan
Defined Contribution Plan Disclosure [Line Items]
Contributions	6.2	5.9	5.3
Local 282 Pension Trust Fund
Defined Contribution Plan Disclosure [Line Items]
Contributions	4.3	4.4	4.8
Operating Engineers Pension Trust Fund
Defined Contribution Plan Disclosure [Line Items]
Contributions	1.2	1.2	1.1
Trucking Employees of New Jersey Pension Fund
Defined Contribution Plan Disclosure [Line Items]
Contributions	0.7	0.6	0.7
Other Pension Fund
Defined Contribution Plan Disclosure [Line Items]
Contributions	$ 2.1	$ 2.0	$ 1.9