EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 37.6	$ 50.4	$ 136.5	$ 134.4
Weighted-average shares for basic EPS (in shares)	83,300,000	83,300,000	83,300,000	83,300,000
Plus incremental shares from assumed conversions of long-term incentive plan shares (in shares)	100,000	0	100,000	0
Weighted-average shares for diluted EPS (in shares)	83,400,000	83,300,000	83,400,000	83,300,000
Basic earnings per share (in dollars per share)	$ 0.45	$ 0.61	$ 1.64	$ 1.61
Diluted earnings per share (in dollars per share)	$ 0.45	$ 0.61	$ 1.64	$ 1.61
Anti-dilutive shares (in shares)	0	0	0	0