LEASES - SUPPLEMENTAL CASH FLOW INFOMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (252.0)	$ (234.9)
Non-cash items:
New operating leases	50.1	62.1
Operating lease modifications and reassessments	96.9	$ 30.1
Decrease in operating lease liability	$ 0.7