EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net loss	$ (18.4)	$ (273.3)	$ (6.4)	$ (9.3)	$ (20.1)	$ 2.2	$ 13.5	$ (0.8)	$ (307.4)	$ (5.2)	$ 27.0
Convertible Cumulative Preferred Stock dividends									5.0	4.9	5.0
Net income (loss) available to common stockholders	$ (19.7)	$ (274.5)	$ (7.7)	$ (10.5)	$ (21.3)	$ 1.0	$ 12.2	$ (2.0)	$ (312.4)	$ (10.1)	$ 22.0
Weighted-average common shares outstanding:
Weighted-average shares outstanding - Basic									64,303,438	61,654,820	37,592,549
Effect of dilutive securities:
Denominator for diluted earnings per share - adjusted weighted average shares and consumed conversions									64,303,438	61,654,820	39,593,701
Basic (in dollars per share)	$ (0.31)	$ (4.25)	$ (0.12)	$ (0.16)	$ (0.33)	$ 0.01	$ 0.20	$ (0.04)	$ (4.86)	$ (0.16)	$ 0.59
Diluted earnings (loss) per common share	$ (0.31)	$ (4.25)	$ (0.12)	$ (0.16)	$ (0.33)	$ 0.01	$ 0.20	$ (0.04)	$ (4.86)	$ (0.16)	$ 0.56
Performance Shares [Member]
Effect of dilutive securities:
Equivalent shares issuable upon exercises of stock options											1,250,000
Stock Option
Effect of dilutive securities:
Equivalent shares issuable upon exercises of stock options											254,312
Restricted Stock [Member]
Effect of dilutive securities:
Equivalent shares issuable upon exercises of stock options											496,840
Series A
Preferred stock dividend rate (as a percent)									7.625%	7.625%	7.625%