EARNINGS PER SHARE - Summary of Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income from continuing operations	$ 25.7	$ 36.0
Net income from discontinued operations	0.0	0.3
Net income	$ 25.7	$ 36.3
Weight average common shares - basic (in shares)	41.5	40.8
Dilutive effect of stock options and restricted stock units (in shares)	2.1	1.1
Weighted average common shares - diluted (in shares)	43.6	41.9
Basic earnings per share:
Continuing operations (in dollars per share)	$ 0.62	$ 0.88
Discontinued operations (in dollars per share)	0	0.01
Basic earnings per share (in dollars per share)	0.62	0.89
Diluted earnings per share:
Continuing operations (in dollars per share)	0.59	0.86
Discontinued operations (in dollars per share)	0	0.01
Diluted earnings per share (in dollars per share)	$ 0.59	$ 0.87