SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Weighted-Average Common Shares Outstanding Assuming Dilution) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weighted-average common shares outstanding	133.0	133.0	132.8
Dilutive effect of Stock-Only Stock Appreciation Rights	0.2	0.2	0.3
Dilutive effect of Other stock compensation awards	0.5	0.4	0.4
Weighted-average common shares outstanding, assuming dilution	133.7	133.6	133.5