LEASES (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Finance lease costs, Amortization of lease right of use assets	$ 14.0	$ 2.0
Finance lease costs, Interest on lease liabilities	4.3	0.8
Operating lease costs	291.2	239.6
Short-term lease costs	92.3	89.2
Variable lease costs	31.1	31.6
Total lease costs	$ 432.9	$ 363.2