SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Depreciation, Depletion, Accretion and Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Depreciation	$ 343.4	$ 315.2	$ 300.6
Depletion	31.2	21.0	22.4
Accretion	13.1	12.4	11.0
Amortization of right-of-use assets	7.1	1.6	0.1
Amortization of intangibles	68.2	46.6	40.5
Total	$ 463.0	$ 396.8	$ 374.6