SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Weighted-Average Common Shares Outstanding Assuming Dilution) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weighted-average common shares outstanding	132.8	132.6	132.3
Dilutive effect of Stock-Only Stock Appreciation Rights	0.3	0.3	0.6
Dilutive effect of Other stock compensation plans	0.4	0.3	0.5
Weighted-average common shares outstanding, assuming dilution	133.5	133.2	133.4