SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)	12 Months Ended
Dec. 31, 2021 USD ($) item state segment factor	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Change in Accounting Estimate [Line Items]
State of incorporation	NJ
Number of states \| state	22
Number of demographic factors \| factor	3
Revenues from discontinued operations	$ 0	$ 0	$ 0
Bad debt expense	$ 1,300,000	1,100,000	1,400,000
Number of Rabbi Trust estabished \| item	2
Net gains (losses) of the Rabbi Trust investments	$ 6,100,000	4,500,000	4,000,000.0
Unrealized net gains (losses) of the Rabbi Trusts' investments	5,300,000	4,100,000	3,700,000
Loss on impairment of long-lived assets	0	0	0
Goodwill	$ 3,696,700,000	$ 3,172,100,000	3,167,000,000.0
Percentage of goodwill in total assets	27.00%	27.00%
Percentage of net property, plant & equipment in total assets	41.00%
Number of operating segments \| segment	4
Number of Reporting Units \| item	19
Percentage of net other intangible assets in total assets	13.00%
Stripping costs	$ 90,700,000	$ 90,400,000	86,100,000
Capitalized pre-production stripping costs	95,600,000	92,900,000
Asset retirement obligations	315,200,000	283,200,000	210,300,000
Spread between the amount accrued and the maximum environmental loss	3,100,000
Maximum self-insurance coverage per occurrence for losses related to workers' compensation	2,000,000.0
Maximum self-insurance coverage per occurrence for automotive and general/product liability	$ 10,000,000.0
Accounting Standards Codification Topic 740 - Income Taxes recognition threshold for uncertain tax positions	50.00%
Goodwill impairment charges	$ 0	$ 0	$ 0
Income tax benefit recognition threshold more likely than not	50.00%
Goodwill [Member]
Change in Accounting Estimate [Line Items]
Number of Reporting Units \| item	11
Minimum [Member] \| Machinery and Equipment [Member]
Change in Accounting Estimate [Line Items]
Estimated service lives	3 years
Minimum [Member] \| Buildings [Member]
Change in Accounting Estimate [Line Items]
Estimated service lives	7 years
Minimum [Member] \| Land Improvements [Member]
Change in Accounting Estimate [Line Items]
Estimated service lives	3 years
Maximum [Member] \| Machinery and Equipment [Member]
Change in Accounting Estimate [Line Items]
Estimated service lives	35 years
Maximum [Member] \| Buildings [Member]
Change in Accounting Estimate [Line Items]
Estimated service lives	20 years
Maximum [Member] \| Land Improvements [Member]
Change in Accounting Estimate [Line Items]
Estimated service lives	20 years
Polaris [Member] \| Orca [Member]
Change in Accounting Estimate [Line Items]
Ownership percentage by parent	88.00%
Namgis [Member] \| Orca [Member]
Change in Accounting Estimate [Line Items]
Ownership percentage by noncontrolling owners	12.00%

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For a tax position that meets the more-likely-than-not recognition threshold, we initially and subsequently measure the tax benefit as the largest amount that we judge to have a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority.

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Best estimate of the reasonably possible loss exposure in excess of the amount accrued for environmental loss contingencies at all sites for which a range can be reasonably estimated.

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