SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Liabilities Under Self-Insurance Program) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Self-insured liabilities (undiscounted)	$ 137.7	$ 75.6
Insured liabilities (undiscounted)	$ 3.6	$ 3.7
Discount rate	1.10%	0.30%
Other accounts and notes receivables	$ 0.0	$ 0.6
Investments and long-term receivables	3.4	3.6
Other current liabilities	(50.7)	(20.7)
Other noncurrent liabilities	(83.2)	(57.6)
Net insurance liabilities (discounted)	$ (130.5)	$ (74.1)