EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net earnings (loss)	$ (1.9)	$ 10.9
Less: Preferred stock dividends	(1.9)	0.0
Net earnings (loss) attributable to common stockholders	(3.8)	10.9
Net Income (Loss) Available to Common Stockholders, Diluted	$ (3.8)	$ 10.9
Denominator: (shares in thousands)
Denominator for basic earnings per share - weighted-average shares (in shares)	49,264	48,973
Potentially dilutive shares resulting from stock plans (in shares)	0	735
Denominator for diluted earnings per share - weighted-average shares (in shares)	49,264	49,708
Net earnings (loss) per share:
Basic (in dollars per share)	$ (0.08)	$ 0.22
Diluted (in dollars per share)	$ (0.08)	$ 0.22
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive equity awards not included in weighted-average common shares—diluted (in shares)	10,600	100
Common Stock, Restricted Stock and Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive equity awards not included in weighted-average common shares—diluted (in shares)	600